Car appreciation... the aesthetics, the engineering, etc

No. I've only used Porsche ones and Avantgarde, who tend to do older stuff.

The concept is great, you often get the same even once they've taken their bit (used to be 10% or £2k, whichever is highest) and they don't have to find the cash to buy the car or take the risk. Everyone's a winner.

I guess if the company went bust after selling the car but before paying you there would be an issue...

Have a chat with them, you'll know if it feels right.