I’ve purchased a couple of lenses from KEH Camera with good success. So recently I tried trading in some old film gear and a newer Nikon AF-S lens with them. It was pretty easy and all went well.
I got lucky because right after they sent me their quote, they put Nikon gear on 10% off. Plus I got an extra 5% on my quote since I used the money at their store. So got a like new Nikon 40mm micro and a few nice accessories for an even swap.
Anyway, if you’re considering trading or selling gear on-line, now you know at least one person has had a positive experience with KEH.