I drove an Avon 320 jet rib earlier this month. It was the one with handlebars, like a jetski with a rib built around it, 2 stroke engine, not sure what size, bench seat at the back. The sea was fairly smooth and it was great fun - really fast and an absolute blast. I've also driven the similar Williams 3.25 jet rib, which has a proper steering wheel and driving seat at the back.
If you don't mind getting a bit wet, I think they're both quite similar to driving a jet ski. The Williams is almost scarily fast - I never got it to full throttle.
However, if you want to take anybody out with you I think they're too small. In any sort of chop the passengers are going to get wet. I've been in the bow seat of the Williams in a fairly mild swell and got absolutely soaked. Really they're mainly used (and designed) as tenders to much larger boats.
I'd recommend getting something bigger - at least 4metres. I launch a 4.8m Ribcraft easily single handed and other people seem to cope with up to ~5.5m or more single-handed. It'll make a much more viable boat for different conditions and it means you'll probably get more use out of it.
Hope that helps,