Yeah, I also owned a 750 SXI PRO. It was definatley my least favorite ski, just everything about it was off it seemed. Sluggish, needs an aftermarket ride plate, handling is just awful.
Not complaining because I did pick the ski up for 150 bucks complete. But it was time to move on after 1 summer on it.
More Power, Better Handling, SXR for you!
The 750 handles great in IMO. I perfer it over the RN although i think the 701 is a way better engine.
I have never rode a SXR so i have no advice on that. I would say keep it "battle of the generations" like strictly said.