I have no experience with them.
Depending on your requirements, you might want to check out Wynne Inc. at the link below. I have heard good things about them and recently ordered a set of new Model 310 sliding*windows for our Krogen Manatee. We haven't received them yet so I can't give you any more info yet.
-- Edited by GarryP on Wednesday 13th of April 2011 08:47:28 AM