I haven’t, but have been looking at them recently.
They’re not a ‘dealer’ in the conventional sense, but resell ex-fleet cars. My understanding is that you view (by appointment)/buy the car at one of a number of locations that are little more than car parks with a Portakabin.
There are a lot of complaints on-line about the lack of dealer facilities, but I suspect these people are missing the point…
It’s perhaps closer in concept (and price) to buying from auction, with the benefit of the basic statutory consumer rights of buying from a ‘dealer’. If you go in with your eyes open as to what actually happens, and are happy buying in that way, then it could be a reasonable way to source a car.
Note also that the price of their cars falls over time if nobody buys them.
I think someone has commented on here before about buying from them – hopefully they can add some real-world perspective (EDIT: Previous thread about this)