I have had some interesting experiences over the years. Most of my numerous bikes I traded in on another but one in particular I remember. It was a Yamaha 750 Seca. I had it tricked up with the Youshimara crap. It was fast, real fast. I sold it to an older guy who was in love with it (never fall in love with a vehicle, vehicles can't return the love).
I delivered it to his house. He paid me cash, I liked that. Little did I know his only experience was a moped. I dropped it off, he promptly got on went down his drive, across the street and hit a tree, point blank in first gear at who knows what RPM.
He bent the bars, trashed the header and squared the front wheel. I almost cried. There wasn't a mark on it before that. My buddy who rode over with me looked at me and said "It's not yours anymore, you have the money. Sucks to be him". We left on his bike. I hope he sold it. It was way too much for him to handle.
I've only let one person ride the R3. My good friend Jim Hoefflin. Jim has a Softail Deuce (I think). He wanted to ride the R3 and Jim is a very cautious responsible rider. He took it around the block and came back smiling. Knowing Jimmy, it never went over 30.
No one and I mean no one rides the sidecar outfit. I even have a pre-printed release in case it ever has to go in for service that the the servicing dealer cannot, under any circumstances ride the bike. Bikes with sidecars have very peculiar handling characteristics and someone with no experience will promptly wreck the outfit. There is a rather large learning curve associated with an outfit. Besides, I'd be pissed off and in the suing mood if some uninitiated wrench spinner wrecked my baby. It would cost upward of 20K to replace just the physical parts. There is no placeable value on the hours it took me to build it.