It's been covered in numerous threads. You bring your KCBS membership to the RD, they give you a day pass. You are allowed to visit the RD as many times as you heart is content via an unlimited supply of day passes.
This has not been told apparently to the RD locations of greater NYC...
So, I got my KCBS 'kit' in the mail over the weekend and called the local Restaurant Depot to confirm that I can visit on occasion. The young lady made it obvious they weren't interested in having you come by too often..
So, for those of you that have done the day pass thing, how frequently do...