Cheap, easy to install, aluminum ratcheting system; piston; and housing, soft paddles, QEPH housing.
Didn't get up to 30 bps
No directions came with the parts
Since I was getting an E-grip, I knew I needed a cyclone upgrade and I found this one for $45. I thought at a price like that, why not? So, a week later, I got the parts and put it together. It fit well, but you needed a little common sense and know-how since it didn't come with directions and you needed to reuse some old parts. After assembly, I took the gun out (in the cold) and fired at 13bps, then 15, then 20, and then 30. 30bps turned my paintball gun into a shotgun, 20 bps worked just fine. I haven't tried 25 bps just yet, but it may work. (It might be the fact I'm running the stock hammer though and not the zero kick hammer.)
I am very happy with this upgrade. Without a doubt raised my max bps, good solid parts, cheap, great for the machine gunner on a budget.