I have both of the Vector Flight Extra's, the 58" and the 66".

I put an OS 1.20 pumped engine in the 66" and it flys quite well. The only problem I had was the landing gear was very weak and made it bounce on landing. Chipped a couple of props (turning a 16" prop on 1.2) due to low prop clearance and flex in the landing gear. A freind of mine gave me the landing gear off of a VMAR cap he crashed last summer and now I have no problems at all. I love it.

I am putting a Saito .91 in my 58". I have not yet flown the bird yet but if it handles like the 66" I am sure I will have another sweet bird.