Has anyone used vehicle exchange to sell their car?

I'm just trying to find out if this is legitimate.
Answers:
NO ITS ALL A SCAM.
Dont fall for people ringing you up saying that they have a buyer but it will cost you £xxx to advertse with them,
Genuine buyers will contact you direct.
Don't do it. There's always a reason on the other party as to why they won't sell and just want an exchange.
Yes its legitimate.