Heh, I guess I'm like one other person posting here: I bought the A45 at Crutchfield and popped in here to see if there was anything else that was interesting to learn about it after charging it, loading it up with some music, and tweaking the settings to get it sounding just right... only to find it's a new product. Well, I guess I got in on the ground floor by accident.
I listened to it in the store with my Noble 3 universal IEMs, so I knew it was going to be worth the cost, even if it only paired well with them. Turns out it drives my HD 650s just great without an amp, so I'm completely happy with my purchase as far as sound quality is concerned and that it plays well with all the equipment I already own. My only gripe so far is that it won't detect any of the music I have on the microSD card I normally keep in my phone for music/video/images. I hope I don't need to reformat the card and move all that stuff back, but i guess I'll do that if it will work. Sadly, Sony doesn't give us any true microSD troubleshooting suggestions, nor do they even bother to tell us what the requirements are for microSD cards to work in the DAP.