Great Amp for the price.
This is a really well made design, and for $175 dollars, you're not going to find much better, for the money.
So, what's wrong with it? Well anything at this price is going to have shortcomings-- or it would be much more expensive. This makes perfect sense. I think, for starters, this amp is too powerful.
Wait... TOO much power? How can that be!?
Plug a basic headphone into this amp, barely crack the pot open and it's blasting. Worse, because it's throwing so much at the headphone at once, you quickly lose definition, detail, and spatiality as volume increases. It's got a feeling that it's jamming everything together in one blast-y sound wave. If you attenuate the input signal (bring it down), things get better, but then you begin to pick up noise.
So what's there is fine, and you can work around it-- but let's get to the worst issue. THIS: I can't find a headphone that pairs immediately with it. I want to say-- Oh yes-- The TR-X00 is ideal. But it's not. That headphone sounds better when paired with my other gear. And at $175, I'm not seeking a lot of headphones to pair it with. So it sits on a shelf, looking for a mate that will likely never materialize.
I would think, given its size, this amp would be PERFECT for a great pair of in-ears. Nope. It sounds even worse than when matched with mid-fi headphones. My IEMs prefer the ALO Continental V5 to this amp. Now the V5 costs more, but it delivers a better soundstage and more airy separation, and it's portable. Don't bother-- you can't buy it any longer.
Ouputs: 1/4" and 4-Pin XLR. I doubt many people will bother with running the balanced out of this amp, I think it would have been more appropriate to add a 1/8" in its place.
Inputs: RCA Only. You will out-grow this fast.
Build-- Looks great, but the buttons and knobs are cheap, and feel like they're fragile. It doesn't have "built to last" quality-- nor should it at this price.
So I CAN recommend the product. If you're looking for a good, low-cost amp, this will do the job. But if you're climbing to higher ground with your gear, I'd aim higher. You will out-grow this fast.
Would recommend to a friend.