I'd rather just buy me pads and a controller interface for my mac then to have some company throw all the consumer home-studio stuff into a dedicated chassis for me. Not very flexible... Hey, I'd rather use the money on a used mac dedicated to the music production only, with a pads+controller and a better but portable sound card (like the Apogee Duet I'm waiting on now, receiving it tomorrow maybe, looking forward to it). Or I'd rather get a dedicated iPod touch with "Beatmaker" on it and use the rest of my money on records...
But I rather stick to my MPC and SP1200! I have tried working on software, and still don't see why I should switch to it, I'm super happy with the way the MPC and SP works, and sounds.