LennyJ,
I have the ASP .91 four stroke in mine. As Splatt said, you may have to re-do the landing gear as have I. With the stock gear, I was bending back the gear after every landing. I ended up installing some Dubro gear. http://www2.towerhobbies.com/cgi-bin...?&I=LXNM65&P=0

As for power, if you like vertical, you'll love the combo. I can take off in about 10 feet and keep climbing straight up forever. [X(]
I usually fly at 1/2 throttle.
As for the ASP, double check ALL the bolts periodically. The cam cover bolts came loose on mine. I couldn't figure out why it wouldn't idle... [&:]
Other than that, it's a set it and forget it motor. Try a 13 or 14/4 APC, you'll love it.
Now if I can just get those rolling circles down.