Well, I guess I need to qualify what I said about on-board sequencers just a bit...
I DO use the G70's Recorder, which does a grand job of 'capturing' the arranger's complete output with minimal hassle, but usually, unless my editing needs are almost non-existent, I'll bang the SMF quickly, via USB, straight over to Cubase, and do any major surgery there.
My G70 tends to either be at a gig, or at home in front ofd the computer, so it's rare that I am in a composing situation where I DON'T have the computer handy. The G70's sequencer is about as full featured as any on board sequencer can be, but it is still a shadow of the power and ease of Cubase...
However, the Roland's have this section called Makeup Tools, where you can edit sequences and styles, with respect to their headers... Patch, volumes effects, dynamics, and detail editing INSIDE a drum kit (change sounds, dynamics, volumes, effects for each drum sound) that is head and shoulders better than doing it on a computer (most of this is sys-ex, anyway).
So, if the 'capture' doesn't need more than just a remix, and some tweaking to the drum kit, occasionally, the piece doesn't end up in Cubase. But that's a rare thing, as it's next to impossible to edit out any 'glitches' (OK, just difficult and tedious
) in a list editor... MUCH easier in Cubase, IMO...