F.Audio FA1 is a very strange beast, i'm not quite use to it right now and will need more listen, I say this in a positive way, as it make me the same thing with Ibasso DX90 wich was my first serius DAP. So, this time I will try to NOT be hysterical even if i'm VERY happy with FA1!
SOundsignature as said is unique, it effortlessly give lot of details that I never heard in music....even if I have heard more than 10 good chifi DAP....its like the AK chip can dig and show you details that wasn't able to be read with other DAP, cause its not IN YOUR FACE and this is why perhaps I read on russian forum that it do not give WOW effect,wich for me is the opposite, I listen laid back music that now have lot of layers mix togheter but all discernable quite easily, without sounding harsh at all to a point that perhaps this DAP make you listen music louder in fact. How say...this sound really in between digital and analogue, like if it was mix togheter, cause too digital can sound cold or clinical and it not the case, especially when music have bass in it cause bass rpesentation is very thick and go deep, really deep (like AK4490 but with a little more texture). Imaging is very revealing too, but I do not feel its extra deep, more panoramic like presentation, you wanna turn your head to see the sound source. Sound is slightly V shaped I would say, cause bass is quite lively and spot on comparatively to rest of sound spectrum, but not in a clumsy boomy way, more like if the bass sparkle more than the highs wich are ultra detailed but never harsh or very dynamic, the mids and vocal are textured, clean and another time very enjoyable but not enveloping and fowards, listening right now to Vulnicura by Bjork, vocal is in the middle, very ''HD'' sounding but not expensive, it stay in the middle of all the focked up sound and bass of the tracks, all is ultra detailed, fast and smooth sounding at the same time....just incredible the numbers of sounds and instruments I can pick up!!!!!!!!!!!
About UI, hum, not test enough, but the good thing is that I do not have any bug issue (even with a chinese firmware update!), it is about average in term of reading tracks, playing one from microsd is slower than from the 32G(!!) internal memory. It isnt particularly user friendly and would prefer that volume have buton at its side and not from front wheel (non scrolling) buton. The weight is exactly 191.14G (hehe, got a balance for.....euh). I did not charge battery yet so can't really tell, but it make about 5H I listen to it at high volume (60-80). Amping is quite powerfull because i'm the kind to push it very high and I never go above 80 out of 100 even with 64ohm Headphones.
Construction is like a brick, and an heavy one with its 200 gram. It feel nice in hand, but it do not include screen protector so I hope it will no scratch easily.
I will share more impressions once I compare it with other DAP: X3, X10 and DX90....just cannot stop listening to it right now. Sorry, not sorry!
For more impressions (using google translator) there a lot in this russian forum:
http://player.ru/showthread.php?t=198262
CHEERS!!!!!!!!!!!