[dpvu]

They're good, solid units. The air seal is very good and the wheel works extremely well and is better than the standard V2 hopup dial. It's easy to install and it has a feature where an o-ring will retain BBs so you don't get the 2 or 3 dropping when you change mags. You have to be careful though because if you use it and you try and clear your rifle by shooting a few shots in semi, there will be a couple BBs in the hopup you cannot get out unless you turn your AEG upside-down.