I decided to bump this thread just to let you guys know that David of Keces provides excellent customer service. I now own the 151 (bought it 2nd hand) and I had a very small technical issue which David was quick to respond to and ultimately it's fine now and I'm enjoying this very nice sounding DAC. I bit of a departure from the analytical DacMagic (which I enjoyed as well) in that it's not as bright but on the other hand the 151 is more "musical" (I don't know if that's the right word).
If there's anyone still undecided about buying this DAC, stop! Go for it! I'm thinking this might be a good DAC to pair with Grado's. I'm thinking it'll help balance out Grado's usual bright signature. I will know in a few days when I get my amp.
PM replied, DA-151/151 Mk2 will work with basically any recent win/mac/linux machines, I'd say within the last 5 to 7 years should be pretty safe. As for Ipod, that connection is only for ipod to dock to a PC, and will not work in any other way, including connecting to a USB DAC or the like.
PS: I mostly monitor the forums via the reminder email that the forum sent out automatically, I don't check out the forums as often at the moment, but I still answer all questions directed to me via email, PM or some of the thread that I have subscribed as fast as possible.
Also happily listening to a Keces DA-152 at work and a Keces HA-171 with the Pecahtree iDac at home. The iDac does add some nice detail over the DA-152. Overall I still love the punchy nature of these amps.