Yeah, I sold my MPC4000 about 8 months ago after owning it for 4 years and bought a MV-8000. The biggest mistake I ever made! I'm selling my MV-8000 on Ebay right now and got a MPC4000 on the way (will be in tomorrow). That dumb move cost me hundreds of dollars. Anyway, if your using the Motif Rack for all of your instrument sounds, I would highly recommend the MPC4000 over the MV-8000. The realtime-timestretch that they advertise on the MV-8000 is garbage in my opinion. Don't know if they improved it on the MV-8800. With the MV-8000, every once in awhile I'd chop loops messing around and to make a long story short, if you have a loop that needs to be timestretched +/- 10bpm's, it's going to sound like ish. For example, I chopped this loop at 120bpm and I wanted to timestretch it to 90bpm. By the time I got down to 110bpm, the sample sounded warbled and choppy. Of course you can get around this by timestretching the loop on a computer (ex. FruityLoops, Acid), and then re-sampling the loop on the MV, but flawless timestretching is not something you can do on the MV exclusively in my opinion. The fact that you can hook up a monitor and mouse to the MV-8000/MV-8800 is pretty slick too (especially adjusting chop/loop points with the mouse). But these are the only two advantages the MV's have over the MPC4000 in my opinion. The sequencer on the MV's are not *ucking with the MPC4000 (I don't care what nobody says)! I personally don't quantize my drums and you would think without any time quantizing that both machines would perform the same, but it's not the case. The MV-8000 even with time quantize off was not as accurate with timing as the MPC4000. I'm sure you will have people tell you otherwise, but unless they used the MPC4000 for 4+ years, and then the MV-8000 for 6+ months then they opinion don't mean ish to me. If you got any other comparison questions between the MPC4000 and MV-8000 I'd be more than happy to give you my opinion for what it's worth.