Okay, you talked me into it.
Just spent the last half-hour or so putting the Geek Out V2+ Infinity and the Chord Mojo in a short-face-to-face contest. This clearly is not a definitive study by any stretch of the imagination, and is only using one headphone and in SE versus balanced mode (don't have a 3.5mm balanced adapter yet for my 2.5mm TRRS terminated Noble K10's - it's on its way here). Used one of my favorite Peter Gabriel reference tracks - "The Time of the Turning (reprise)" from OVO.
While they're both excellent, my ears at this point would have to give the win to the Mojo. They're both really resolving and impactful, but the Mojo is just a bit more musical. The mids are what really do it for me (the reason I love my K10's and LCD-3's) and the Mojo just has a smidge more "magic" in the mids, a bit more emotion that really is captivating. I think it's how Rob Watts implemented the FPGA chip using the technology from the Hugo and his other TOTL products. In the OVO track the trumpet that opens the song just has a bit more texture and nuance and emotion, and the vocals and other instruments then come in and combine in a way that makes me want to tap my toes maybe 15-20% more than the V2+ Inf. As always YMMV and this is just IMHO...
When it comes to form factor, well it's not a fair fight. The Mojo is built like a tank, and the V2+ is still trying to find its real skin. I hear the new chassis is coming along, but we'll have to hope it's better than the prototype. Also the Mojo accepts not only USB (like the V2+) but also coax and optical, so it's a bit more flexible and can therefore be paired with more portable transports (e.g. Fiio's coax and AK's optical as well as all the smartphones with some type of USB). On the other hand the V2+ has the adjustable gain and filters, where the Mojo doesn't, but the Mojo has plenty of power.
So if I had to recommend one right now, in it's current form, I'd have no problem saying jump on the Mojo train and don't look back.
Cheers
@mscott58 - well written review. Would you please tell us which test songs (or genre) and which headphones you were using for this comparison?