Reading these rave reviews I picked one up myeself for times I don't want to (or can't) drag along my Firebox, laptop, and backup battery but still want to use phantom-powered mics.
Battery life while supplying 24V phantom (my choice as my mics will take it) was more than adequate. Using 2000 mAh NiMH AAs I made it well past the three hour mark and got bored of recording my stereo.
Mostly echoing others' comments:
Worked with a 4GB Transcend card out of the box.
Headers get screwed up on >2G files.
No problem with multiple files that combine to exceed 2G.
It only takes a second or two to end one file and start a new one.
It did remember my settings (external input, phantom on, 24/44.1) even when the power was cycled and the batteries removed briefly.
Level meters are pretty decent.
My Mac only recognizes it as a USB 1.0 device, so transfers are slow (about 20 min / gigabyte)
XLR inputs seem to hold onto a cable pretty firmly, but there is no locking mechanism. Not sure about the long term implications of that...
The headphone amp is a piece of crap. Really, it's awful.
Definite buzz even when not playing anything back.
Line out sounds decent though, and the recorded files sounded nice when played back through my main system, although it wasn't really good material to judge on.
I should be taping a show with this on Friday and will post a sample for everybody asking about the preamps etc.