I have had my Fulla for a couple of days now and while I'm pleased with the sound, I'm not impressed by the whole package. My Volume pot is noisy as in with no music playing and I adjust the volume, I can here the pots wiper. Of course the metal edges, wile not cutting sharp are reminiscent of a DIY build not a commercial product. the volume knob is a little short and my finger tips catch the metal edges. Lastly the bag is useless. The Fulla is too tall for the drawstring to be of any use. I would have gladly paid 10 to 15 more to get a finished product. I own 6 pieces of Schiit gear and this is the first I was disappointed in.
So, I have the original M/M stack and am very pleased with the value I've gotten.
That said, I've watched the initial rollout of the Fulla and have to admit that I agree with the above quote -- so much so that I didn't buy the Fulla even though I wanted to.
I get being brand-loyal...and I do like my Schiit stack...but I don't blindly support a product just because I like the brand.
In addition, I'm also confused at many of the comments in this thread especially related to some 'applications' of this device. For instance, all the Rube Goldberg attempts to pair this thing up with a phone (i.e. powered USB, etc. discussed below) really don't make sense to me.
From my perspective, this unit competes with Transportable NOT Portable Dac/Amps.
Portable
Since, it doesn't have a battery (yeah, I know, 'we don't do batteries'), it's at a distinct disadvantage for truly portable applications compared to Dac/Amps like the Fiio E07K ($89) or the iBasso D-Zero MkII or several other portable solutions.
TBH, on paper and in the reviews, the iBasso appears to be a steal for a portable Dac/Amp. For $119 out the door, you get a Dual Dac/Amp combo with OTG, RCA, and USB cables, silicone strap, and a carrying pouch.
Contrast that with the Fulla. For $89 out the door, you get the Dac/Amp and a USB cable. Then, you have to buy the OTG cable and the Powered USB hub -- cobble it all together with the Fulla and, hopefully, you have audio from your phone! Very cool, if you have a portable wall outlet for the Powered USB Hub?!
Transportable
I did seriously consider the Fulla as an option to replace my Fiio E10 (i.e. throw it in my laptop bag). However, the rollout issues (handled admirably by Schiit) and the ongoing QC concerns that are periodically brought up made me go another direction. I looked at a variety of options including those below the Fulla's price (HiFiMeDIY), at the Fulla's price (Fiio E10K / E07K), and above the Fulla's price including Meridian Explorer, AQ Dragonfly, HRT, etc.
After reading reviews/threads/etc, I boiled it down to the E10K at $65 and the Meridian Explorer at $150. The design, build, and consistently good reviews of the Explorer convinced me to spend the extra $$. Very happy I did -- sounds fantastic!
But...to be honest, if budget was the primary concern, I'd still go with the E10K over the Fulla at this point. While some might argue the Fulla is a tad better sounding than the E10K, the additional functionality (line out, coax out, gain switch, and hardware bass boost ) would tip the scales for me. Besides, Fiio certainly upgraded the E10. The E10K has a new DAC, improved circuitry, and a better opamp (same as Fulla's) with buffering. Lastly, my E10 just plain worked from day one and still does...no issues. I expect the E10K would do the same.