When I first decided to get one there was only like 1 or 2 companies making knockoffs and they were all FRP. I had one but wasn't that happy and found a pretty decent deal on an OEM unit from a member that was stationed in Japan at the time. Now that urethane knockoffs are readily available that's what I will be going with next.
Only major difference besides the STi badge are the OEM has a far better out of the mold finish, a nice matte black finish and it also has some nicer hardware with the metal mounting tabs.