[itishappy]

Sure, but they can also be a hindrance, and that's been my experience playing music with my computer keyboard. If intervals are all you care about (and it's all you can care about) then I've found it easier to just enter notes with the mouse.

Alternatively, an Akai MPK Mini MK3 costs $100 and gives you twice the range, no limit on simultaneous keypresses, velocity sensitivity, a mod wheel, analog knobs, and velocity sensitive drum pads.