I have a GP Cub .60 with a Saito .91. Works fine, except that I lost a part on the maiden flight and spent a month and a half trying to get a replacement.[

] I haven't tried floats yet, but plan to next summer. I honestly think the .91 will be fine for floats also.
I only have a couple of tips. I bought a fiberglass cowl from Stan's because I didn't feel like trying to make the multi-piece plastic one work that came with the kit. I have the Saito mounted out to the side and it lookes pretty good. Make sure you don't glue your servo tray in or cut your pushrods until you have balanced it. I put the servo tray in the plan location and ended up having to put some weight in the nose to balance. I probably could have avoided it with better planning.
All in all a great kit.
-Scott