Here is my impression on Chord Mojo.
First of all, I am not a HI-FI guy, but the brain between my small ears loves to listen to a good sound
. I am quite mobile most of the time. I have three Shure earphones (SE215, SE535 and SE846). I wanted an upgrade for my current DAC Denon DA-10. I decided to give a Mojo a try. I were not sure if it is good idea since all my soundtracks are just FLAC 44.1kHz.
Out of the box, I were surprised how small this is in compare to DA-10. It feels like a metal brick with some considerable amount of weight. The build quality gives the impression that you can take mojo anywhere you go without worrying about it. I truly appreciate that. I am sick and tired from companies putting electronic devices in metallic bindable boxes.
For the listening, I use VOX media player in Mac OS X. I kept the system as simple as possible. Both the 'Hog mode' and 'Synchronize Sample Rate' options were enabled. When I use SE846 (with the white filter installed), the sound is just fantastic. I am not that good in describing sound, but I will try my best here: SE846 truly shines with Mojo. There is no feeling of congestions which I often get in DA-10, especially in fast paced rock songs. I clearly noticed that every note gets its space making the hearing experience more musical. It is certainly more detailed and smoother. In fact, in one of the tracks I can clearly hear the echo sound pouncing off between drums. In DA-10, the details are there but you really have to work hard to find it. Mojo just presents that to you in a very effortless matter. However, to my ears Mojo is a bit brighter, but not that much. If you don't like this signature and you own SE846, just change your SE846's filter and you should be good to go.
The story is the same for SE535. However, I have to say that it is not as impressive as SE846. On the other hand, SE215 is a totally different case. When I connect Mojo and SE215, the sound becomes more like a V shape. To my ears, the vocal is just too much forward and loud in compare to the background. This significantly distorts the image making it unrealistic and a bit weird to be honest. Perhaps, Mojo passes so much information, and the driver in the SE215 just can't handle it. I would rather connect the SE215 directly to my laptop than to use Mojo.
I just to make you aware that mojo gets worm or even a bit hot sometimes. Certainly a lot wormer than many DACs I tested for the last two years. Nothing dangerous but it can become annoying in summer. Also, if you plan to recharge Mojo from your laptop, make sure your usb port can handle the high current requirement of mojo (1 Amp). Most laptops, including Apple MacBook line, cannot handle more than 900mA. The motherboard of your laptop will be slowly cooked if you connect mojo. An alternative solution is to use an external adapter. Personally, I use my kindle's adapter. The down side of this is that I have to carry this adapter most of the time in case I need it.
EDIT: After checking other reviews, many mentioned there is a slight noise floor with SE846 and mojo pairing. I can confirm that it is TRUE. In the beginning I haven't noticed it at all, but after several tests I found out that there is a very low hass. Still very happy with my purchase 
So the conclusion:
* For SE846 and SE535, does Mojo improves the sound in compare to DA-10? YES and ALOT for SE846.
* For SE215, NO...Don't buy it, instead upgrade your earphones first.
* Do I recommend it to a friend? YES. In fact, I believe that any sound improvement beyond Mojo will come at a very steep price.
* Do I recommend buying a cheeper DAC? If you have a good headphones and you can afford Mojo, then go for a very long term investment.
