Best thing since ever. Fast, light, extremely well thought-out. My rolands and tascams are not even close - they are getting sold asap. Love the individual volume meters per channel, faders fine, 24-bit recording. I love saving to USB stick straight off the unit or put the SD card into my laptop's card reading slot and mix straight from there. These guys give a great deal with a big SD card - take it.
Positives: great stereo separation, what-you-hear-what-you-get in mixing down, you know what I mean, runs off 6 AA batteries, 2 buit-in mics are good for recording rehearsals and drum overheads, can have 8 compressors on 8 simultaneously recording tracks so it doesn't clip, can record itself (main out into a track in), digital bounce, import wave files from your computer and it will play them as a track in your project, FX can be printed to "tape" or used for monitoring only, works as a USB sound card, metronome can be sent either from the main out or from headphones only - volume control knob on headphones, finally!
Negatives: pre-amps are slightly better than your regular sound card's and require pre-amps for any demo work - no problem for me, I just record off the inserts of a proper mixer or use ART Tubes, FX are not that great and very brittle sounding, so use for inspiration only, no MIDI sync, no outside FX can be used - no AUX in/out, properly needs 2700 Mah disposable batteries or will run out on you without warning (i.e. if you leave it to record a gig for 30 minutes and find it died after the first 10 'cause you forgot to put good batteries in) - all minor stuff, really, this unit really is a game-changer.