A reefwave 45 and a mp40. No issues with either. I do basically no maintenance on them and haven't had any real issues.
I did have the reefwave get stuck awhile back and not rotate, but I just manually pushed it to get it spinning and it fixed itself. I can't recall if it was because a pencil urchin spine was stuck in it, but might have been.
The reefwave is not as quiet as I'd like, given the location in the living room, but it's quieter than the previous I replaced. The MP40 of course is dead silent.