Put this on my macdev cyborg rx. absolutely love it. Saw one review that claimed that it leaked while on. It did this too me the first time i aired it up and it blew out a bunch of white grease upon twisting the cam drive on and off a few times but stopped after a few minutes. Have been using it for 6 months now playing air ball. Still works great. Matches macdevs vampire color scheme and milling pretty well too. Great product.