IG,
We have owed a 4-stroke SeaDoo for 2 years now. I'd recommend the 4-stroke for several reasons,
- they are much quieter than the 2 strokes. Newer models are as quiet as a boat
- they usually have closed cooling systems (antifreeze) so winterization is a lot easier
- as mentioned, the pollution element is a lot less
As with boats, the issues are mostly with the users and not the machine. You won't find ours doing donuts off someones dock (we do them, just go out to the middle of a large area before doing so).
Send me a PM if you would like more info on where we got it, etc.