Both versions appear to be rare to have at this point. Tell me somthin', flying off an asphalt runway I tend to see a lot more bounce and as strange as it may sound, both versions seem to be much more easier to land with snow-ski's and/or floats. On slow, straight-in approaches on ski's, they are just as smooth to land as can be. Same with floats yet, on tires, they both wobble a bit and and seem to take a lot more effort to control smoothly. What gives ?. Running a 3.2 FOX and Saito .82. Neither engine misses a beat and they run very smooth. Since these are irriplaceable, I "baby" them both and give them the same care and polish as a full-scale. MM