Jamstix is the only program that I tried that actually sounds like a real drummer, complete with fills and random hits. The built-in sounds are okay, but you get the best result with a proper drumkit in a seperate sampler (like Battery or Kontakt).
I haven't used its real-time capabalities much, since I am not such a great keyboard player. I use it in Cubase SX and found that the program really shines when automating its parameters, most notably the probabilities of snare variations and crashes.
What I would like to see in this program is a better way to program new rhythms. The interface right now is a bit confusing and doesn't offer features to drill down to the low level bits. I'd love to simply have a pattern-editor in which I could assign the probabilities of each hit. This would be especially handy for programming fills, which are now derived from mostly unreadable text files. For now I usually just render the results to MIDI and then tweak them in my sequencer's drum-editor
Saving your own rhythms is a bit weird, since they use a keyword-based system that I find rather clumsy.
In conclusion, this program is a great way to quickly make drum patterns with a live feel to them. It could even replace a drummer for demo-purposes, as long as you're prepared to do some manual programming as well.Read Review
