Hot audio or uDac(2)?

I'd like to know as well. I'm going to buy the m50's next week. And, was considering getting the udac 2. 

uDAC-2 wins over uDAC-1 on all counts except price.

The M50 is very efficient, so you don't need to turn up the knob a lot to get it loud. Some pots have imbalanced L/R volumes at the lower end. So the improved volume pot of version 2 would especially help in the M50's case. Just basing this on Stuff I've Read™ as I have not used any of these DACs myself.

OP, I suggest changing the title of the thread to something like:

uDAC or Hot Audio Bit Perfect

That way you might get more suggestions from people who have these DACs but who don't own the M50.

I have the Hotaudio Dac Destroyer (basically the Bitperfect without volume control), have auditioned the udac-1, and own the M50. Here are my thoughts:

- the dacdestroyer and udac1 are comparable, with my preference for the dacdestroyer simply due to a warmer sound

- M50 really doesn't benefit much from an amp

- even if the udac2 is marginally better, the hotaudio offerings are half the price

I have a Hot Audio DAC and like it very much. I returned my uDAC (original model) because it didn't pair well with my amp. I have replaced it with a Hot Audio DAC-Wow and the sound is more neutral with better extension at either end. (The uDAC was a bit thin in the upper mids.) If appearances matter, be aware that all Hot Audio products seem to have very utilitarian enclosures.  

ive heard  great things about hot audio,   u should definitely get both and compare