Well I give my opinion since I began to master the craft about, it's really a good deal. To work with headphones at home and get a quick result, it works well.
Well, too bad there are not more tracks, it lacks some guitar effects (flanger), and there is the breath at times (maybe not completely due to the machine but more a Compressor set mode ugly buffalo asthma).
That said I could even take a battery very well with a single Shure SM58 planted on a microphone stand at 1m from the battery and connected to the D4. The knobs are nice and the editing mode MP2 can learn to juggle and mix volumes and stereo position of the instruments (the guitar good, right or left? The drums and bass, together or ?...), across what I personally find quite fun, while sending the direct MP2 on the computer by USB cable. Hop, missing a small MP3 conversion software and you can run your sound to all your friends.

Completely positive opinion