I bought a 2nd hand (none working) g&g l85, and did a full re-build (and the conversion to remove pre-cocking/use a standard piston etc).
It was a nice gun when I finished, the split gearbox is nice to work on (in my view)
i know a mate who bought the ics new, and sent it back twice (might be his bad luck). But for a honest view on the ics have a read off ed's review (it's a bit old now, but a honest review)