well, i love this workflow, it's really a pleasure to make a track with samples, had mpc1000 before, and this one is better. i think octatrack is more for live performance, than making a tune. it gives you direct sampling and flexible tools for live stuff..
though mpclive added several new modes to mpc's usual 'nextsequence' and 'trackmute' screen live play - audioclips, xyfx, looper (!) which is great. i haven't tried it yet in performance, but i think, it's huge cons over octa..
one more thing though, mpclive is not really stable as for now, and there's a lot of firmware polishing to do, i think. so i would wait for an year or so, before buying it.. but if you can handle that feeling, when you're betatesting something then yeah, go for it