Disclaimer: The unit was sent to me as a part of a review tour organised by Rose Technics in India. I do not get to keep the unit, and Rose Technics has had no influence in any way in my findings and sayings below. All thoughts and opinions are my own.
Build Quality
The build quality on the RT5000 DAC/Amp/Preamp is good, though the material choices are uncommon. Donning a (faux) leather bottom and metal chassis, the front fascia is a striking golden color and dare I say that the combination of materials and colors is a bit jarring at first but quite likeable in the long run. Its got a bit of sophistication in the looks. However, the lack of any kind of feet is a bummer, and not to mention that the length of the power cord is absurdly short, and will not suffice even in many desktop scenarios.
Usability
This is the only aspect of usage that left a sour taste in my mouth. There are quite a few parameters that can be changed on this device, but none of them are simply intuitive. Firstly, switching to the Bluetooth mode is not so straight forward; which requires to toggle a switch on the back and then also lock in the input from the front using a dedicated button (why?!). The various gain levels have no display so one is left pressing the buttons continuously to gauge an idea and this can be dangerous when using headphones and earphones of high sensitivity. To make matters even more confusing, long pressing the gain button acts as the filter selection switch! And lastly, due to the lack of feet, the unit simply moves around when operating it, if kept on a smooth and slippery surface (even considering the fabric leather bottom).
When used as a headphone amp- the gain level is sufficient for most headphones. But if one is EQ'ing and adding negative pre-gain in the digital domain then the RT5000 will run out of steam, something to be kept in mind.
When used as a dac/preamp- the output level from RCA is significantly higher than the standard 2 Vrms so one may need to turn it down using the potentiometer on RT5000 before adjusting to get a comfortable volume range from a dedicated preamp (if present).
Sound Quality
The sound quality off the RT5000 is same throughout, no matter where the output is: headphone out or line out. And the sound is very clean and definitely on the analytical side. There is nothing much to add to this- you get the idea. It leans significantly towards the analytical side and it also provides all the good stuff that audiophiles want- wide soundstage with very delineated instrument separation, and the entire presentation is more forward and in your face. Is it harsh? No. But it can be. If the recordings are poor, there is no masking. The sound is as transparent as it can (possibly) get. Overall the sound is a bit too forward and in-your-face for me and I have come to know over time that I prefer a more in-your-face energetic presentation compared to the average Joe. That being said, the filters do make an audible difference although quite small, and it can be used to tweak the sound a bit. I made it a bit more relaxed and laid back using one of the filters. Still, I would classify the RT5000 as having an analytical edge to it.
I had the SMSL SU1 at hand, and level matched, SU1 is a bit more laid back and chill, the sounds coming from the level of the speakers and from behind it, whereas the RT5000 was significantly more direct and frontal. When it came to the fine details, I'd say that the RT5000 etches out the instruments more clearly and aggressively in space. In comparison, the SU1 felt less aggressive and also had a bit more weight and warmth to it.
As a headphone amp it's all the same but this time the sound seems to lack dynamics. I would say it's very much similar to the sound of Topping amps. Very neutral with an analytical tilt, but a bit "dull" sounding when it comes to the transients and punch. But that is just me, as I have a personal bias/preference towards amps that have a bit of a character.
Conclusion
All in all, the RT5000 is a (good) analytical sounding device which aims for a squeaky clean and transparent presentation, packed full of resolution. The essence of the sound is carried forward to the headphone amp section as well. The very high gain on the RCA output means one can connect it to power amps direct and have lots of headroom to play with should one need it (if you do not have a dedicated preamp in the chain). However, the UI needs getting used to.
Build Quality
The build quality on the RT5000 DAC/Amp/Preamp is good, though the material choices are uncommon. Donning a (faux) leather bottom and metal chassis, the front fascia is a striking golden color and dare I say that the combination of materials and colors is a bit jarring at first but quite likeable in the long run. Its got a bit of sophistication in the looks. However, the lack of any kind of feet is a bummer, and not to mention that the length of the power cord is absurdly short, and will not suffice even in many desktop scenarios.

Usability
This is the only aspect of usage that left a sour taste in my mouth. There are quite a few parameters that can be changed on this device, but none of them are simply intuitive. Firstly, switching to the Bluetooth mode is not so straight forward; which requires to toggle a switch on the back and then also lock in the input from the front using a dedicated button (why?!). The various gain levels have no display so one is left pressing the buttons continuously to gauge an idea and this can be dangerous when using headphones and earphones of high sensitivity. To make matters even more confusing, long pressing the gain button acts as the filter selection switch! And lastly, due to the lack of feet, the unit simply moves around when operating it, if kept on a smooth and slippery surface (even considering the fabric leather bottom).

When used as a headphone amp- the gain level is sufficient for most headphones. But if one is EQ'ing and adding negative pre-gain in the digital domain then the RT5000 will run out of steam, something to be kept in mind.
When used as a dac/preamp- the output level from RCA is significantly higher than the standard 2 Vrms so one may need to turn it down using the potentiometer on RT5000 before adjusting to get a comfortable volume range from a dedicated preamp (if present).
Sound Quality
The sound quality off the RT5000 is same throughout, no matter where the output is: headphone out or line out. And the sound is very clean and definitely on the analytical side. There is nothing much to add to this- you get the idea. It leans significantly towards the analytical side and it also provides all the good stuff that audiophiles want- wide soundstage with very delineated instrument separation, and the entire presentation is more forward and in your face. Is it harsh? No. But it can be. If the recordings are poor, there is no masking. The sound is as transparent as it can (possibly) get. Overall the sound is a bit too forward and in-your-face for me and I have come to know over time that I prefer a more in-your-face energetic presentation compared to the average Joe. That being said, the filters do make an audible difference although quite small, and it can be used to tweak the sound a bit. I made it a bit more relaxed and laid back using one of the filters. Still, I would classify the RT5000 as having an analytical edge to it.
I had the SMSL SU1 at hand, and level matched, SU1 is a bit more laid back and chill, the sounds coming from the level of the speakers and from behind it, whereas the RT5000 was significantly more direct and frontal. When it came to the fine details, I'd say that the RT5000 etches out the instruments more clearly and aggressively in space. In comparison, the SU1 felt less aggressive and also had a bit more weight and warmth to it.
As a headphone amp it's all the same but this time the sound seems to lack dynamics. I would say it's very much similar to the sound of Topping amps. Very neutral with an analytical tilt, but a bit "dull" sounding when it comes to the transients and punch. But that is just me, as I have a personal bias/preference towards amps that have a bit of a character.

Conclusion
All in all, the RT5000 is a (good) analytical sounding device which aims for a squeaky clean and transparent presentation, packed full of resolution. The essence of the sound is carried forward to the headphone amp section as well. The very high gain on the RCA output means one can connect it to power amps direct and have lots of headroom to play with should one need it (if you do not have a dedicated preamp in the chain). However, the UI needs getting used to.