I've used them in the past and I've been pleased with the service. I was looking for charts for the area where I was going to charter a boat, The Seychelles, seeings as you asked and the charts were old merchant BA charts about 5 years old. Clearly dodgy for port work but as they say the rocks don't move much.
I just sold 11 charts on ebay.
The in date Imrays went for about 8 quid each plus 2 quid postage, and the old 1990s 'planning ' charts reached 2.50 averagely plus 2 quid post.
Only the 1986 Stanfords Southern North Sea didnt sell!!!! /forums/images/graemlins/laugh.gif