So far, I know of a few others that have them in different sizes, and all are very happy with them. Seeing this video when it was posted on HeliFreaks is what spurred me to try one.
http://www.centuryheli.com/products/...tml?pageid=287
That is the bigger G30 with the HWC modified G29 Zenoah engine and it looked to be a real great power system. So I thought I would try their smaller G20 version on my smaller Radikal G-20.