I ordered right when shipment got delayed, and had to wait a long time for delivery (well more than a month). It finally came this week.
I initially had trouble with it recognizing a transflash card I had, but it works perfectly with a different card. It may be a bit picky with transflash cards - don't know why.
So how do I like it? I love it. Really sounds great. I don't know if I can put my finger on what makes it sound so good, but it has a very analog sound to it (almost tube-like) but with plenty of detail and great bass control. I've listened both with my somewhat expensive and inefficient Sennheiser HD-580s, and with my cheap as chips but really great Koss sportapros (modified by drilling holes through the back plastic), as well as some IEMs, and everything sounds wonderful through it. Sportapros (or KSC-75s) and Walnut would make a killer budget system for someone. Someone earlier mentioned how much they liked the sound with Koss portapros, and it is just as good through the sportapros. It sounds a lot better than my rockboxed Sandisk Clip or my Fiio Q1 dac/amp, or the headphone output on my audio equipment.
I thought I would miss having a screen to tell me what is playing, but I'm kind of enjoying not knowing what will play next, and it remembers where I left off (even in the middle of a track). I wish it would play FLAC and higher bit rate stuff, but it's easy enough convert/strip to wav or mp3. The amp is very powerful, and that power is really noticeable in the bass performance.
So thanks to all the people on this thread who discovered it and shared advice about it. It's as good as everyone said it would be, and a very fun gizmo.