It does depend. Let us know what your idea is for how you might integrate the two so's we have a better idea. Me, I used nothing but the mpc for sequencing for like 4 years. Then I got a computer (same box as you have actually), put logic on the thing and since then I haven't used the mpc as my main sequencer too much. BUT - it is still a big part of my setup. It's real cool for a quick way to sample anything going on in your track. The pads are still great for banging out beats - I just bang em out but record the midi into logic. Kind of like using a soft sampler, but the way the mpc triggers samples with the poly, mono, note off etc plus the filters lends itself to very easy/creative stuff. Basically, as far as using the mpc sequencer vs. your software sequencer, it could go three ways - 1. You use the mpc for all sequencing, and use the software like a tape machine, just recording what you've done. 2. You use the mpc to make the backbone of the track, then you record the midi data into the software by syncing the two up. It's not that hard. That way you get the feel of the mpc but the software sequencer for moving lots o' stuff around like usual. 3. You do all your sequencing in software.
If you have all your software stuff set than the mpc would be probably be like a cool addition and maybe inspire different creative stuff...it all depends how much you really get into the way the mpc works, so'd I try it if you know someone with one.