Mick Emmet sold me a 70-200 F4L. https://photography-on-the.net/forum/showthread.php?t=620899
Definitely did not over sell the lens. Communication was excellent and we agreed to meet up and "do the deal" in person. He even pointed out a minor flaw (lens hood), which I think I would have missed otherwise!
I am more than happy with the transaction and would have no hesitation in dealing with him again.