My favourite MIDI controller *ever* was a Roland Alpha Juno-2. IMHO, it had the perfect wieght to the keys, a really great "feel", and aftertouch. The fact that it was also an awesome synthesizer didn't detract from it being an awesome MIDI controller at all.

I sold that synth to fund the purchase of a Zoom SampleTrak ST-224. *slaps forehead repeatedly* STUPID, STUPID, STUPID!

A friend uses his Kurzweil K2000 exclusively as a MIDI controller these days - he works entirely in software, but given what a K2000 is worth on the used market, it makes zero sense for him to sell it to buy a proper MIDI controller - all he'd save is a little bit of space!

I'm actually shopping for a MIDI controller kb right now; interested in hearing other folks recommendations...