I recently purchased a 4*60 ARF (second plane after a Hangar 9 Ultra Easy/MDS 40) and put a Saito 80 in it. I'm not quite finished with it yet, but have mounted an run the engine, which seems fine. It seems easy to start after the MDS, which after 5-6 tanks of fuel still is finicky. It certainly looks beautiful in the engine bay.

I did notice from the engine manual that the 80 weighs 20 more grams than the 91, which was surprising. Is the power and weight penalty likely to be noticeable?. Would I have been better off with the 91?