Had one of these about 12-13 years ago with a G-38 on it.
Flew fantastic! Never had any of the tip stall problems mentioned above. Point rolls, snaps, loops, Cuban 8's, tumbles, etc etc.... whatever you throw at it, it'll do. Mine wouldn't hover with the G-38 on it but I presume these guys putting the 45's-55's are getting them to hover and everything else. I gave mine away, wish I kept it.