I just purchased an A17 as a replacement for my old 80GB iPod Classic 5.5g... figured 8 years with the same player was enough. I'd wanted to get rid of it for quite a while and dump iTunes, but for the longest time there wasn't really any competitively priced portable player with a nice design and equivalent storage capacity. So far I'm thrilled with the A17... the battery life and expandable storage being the main draws for me; but sound quality is also pretty good (most of my collection is 16/44.1, though, so it's not as if I'm really taking full advantage of it). Still in the process of converting my collection to FLAC, since a lot of it was still 128kbps AACs I ripped years ago for the iPod.
I hope Sony eventually releases a few accessories outside Japan... does anyone here have the official Sony leather case; and if so any comments on the quality? I'm considering picking it up, and definitely an official or 3rd party screen protector, on eBay in the near future.
I've never used a portable headphone amplifier, so I'll probably just continue without one for now, at least. Based on the experience of current owners, is it best to stick with IEMs, or are there many full headphones that the A17 can drive comfortably? Sony seems to be pushing their MDR-1As, but are they a good match to the A17, or meant more for the likes of the ZX1/2?