revisiting this old post...
as an old fan of the MPC3000... maschine does look tempting and probably quite useful because it's tied to the computer and has access to longer sounds and more effects...
though, personally, i've lost touch with anything Native Instruments because they seem to just be turning into a sample library company...
but, in my opinion, anything that can record your own sounds, loop them and play them back is useful! just depends on your workflow.