I bought a Samyang lens from them, via Ebay last week. It gave an FEE error.
I returned it to them, they tested it, said it was fine on a D3100, but did give the same error on a D7000. They then took a new one out of stock, checked that it worked on the D7000, then shipped it overnight. I was also compensated for my return postage.
So I would recommend them.