I've had mine for a few years; running a bolt-on stage III (cam, SE heads, SE Ignition, SE coil, V&H Bigshots staggered and the Twin Velocity). I know the pipes aren't the right choice for performance, but I like the look.
The air cleaner seems to work fine, I've had small problems with oil misting into it, but I think most evos suffer from that, regardless of the air cleaner.