I've always been very resistant to using a laptop for a live pa, purely because I have seen soooo many 'live' pas which are NOT live pas - in the extreme situations basically just lining up tracks in place and sticking a few effects over.
Having said that, I have all but stopped playing at the moment, partly 'cos of how busy I am working and doing an MA, but also lugging all my gear (I took a pretty hefty proportion of my equipment) about and needing to find someone with a van etc etc.
Some point I will try and put some in the laptop I reckon, and take some synths out.
But everything was sequenced, I think the only loops were a few guitar samples, and a couple from old tune that I made on a PC and only had audio recordings of.
Basically, I have 3 electribes running their own loops, and the RM1x running a few more tracks on other synths and mix about between them all, bringing bits in and out.
Other main problem is while more and more people are using so much more processing on laptops it is harder and harder to match the sound quality with this kind of set up...