I've had two Hobbistar 60's, the first one had a O.S. 1.08 on it, the one I have now has a 90 Super Tiger. I use this plane for a engine test bed. I also have a O.S. 61 SF-P for it, flies good but not up to the 90. The 1.08 was a bit overkill but fun.

IMHO, this plane needs something a little bigger than a 65 LA, although it will fly ok with that motor, I don't think it will pull verticle with a 65. Buy the ARF and stick a 91 on it.

As for the rolls, it just won't roll as fast as the Avistar. That was my second trainer with a 61 4-stroke, very nice combo.