Ed Moorman, an engine reviewer for RC Report, started an excellent thread a while back concerning the very same JBA .56 that RC Ken just reviewed:
http://www.rcuniverse.com/forum/m_67..._1/key_/tm.htm
I bought a JBA .56 and shipped it to Ed to test, then he bought one for himself shortly after. I'm very happy with mine and wouldn't hesitate to buy more JBA 2-strokes in the future.