Hi Elislater!
Depends very much of what you expect...
Sound:
Have a listen here:
http://www.nordkeyboards.com/products/nord-drum-2 - for some sound demos + 2 videos..
Apart from some very nice sound banks that you can download from the Nord website, it's quite easy to create your own sounds, and there are a lot of sound parameters at your disposal.
As expected from a drum synth It's very well suited for 'electronic' sounds & beats. However, though synthetic, the sounds can have a nice 'organic' touch to them, and the sound responds very dynamically, lifelike to your playing -
It's also good at mimicking tuned percussion - and it can mimic acoustic drum sounds
to some degree, but perhaps not as realistic as some sample based drum modules do...
Playing & Expression:
If you want to play like you do on a drum kit, you'll need pads, or triggers, the ND2 is compatible with all big brand pads, but in contrast to some of the big brand drum modules the ND2 will only register striking force (velocity). It is not compatible with dedicated hi-hat triggers, will only use one zone of 'multi-zone' pads, and will not register striking position on the head like with the Roland 'supernatural' V-Drums. - However I have to say that the ND2 does a lot with just striking force alone, as said the sounds respond very dynamically to your playing, a lot of sound parameters depend on velocity - in that way you can even mimic hi-hat open & close playing a bit - for example -
Size of your kit:
With the ND2 you can build kits of 6 sounds, as it has 6 channels: e.g. bass drum + snare + hi-hat + 3 toms, (- or 2 toms and a ride... ) (or a set of wind gusts and sea noises)
Taken together, it's great for making beats, it is truly an excellent addition to an acoustic drum kit, but whether it can replace one.. is up to you!
Albert