We ate at Planet Hollywood this past Thursday night. After we were seated, our server asked us very nicely if we had any promotions or coupons. We had a 5.00 off coupon and we were using gift certificates. Our gift certificates were weird looking - I had bought them from someone on ebay. They came in a round film can tin and the certificates themselves were round. The woman had never seen them before and she took them up to a manager, who ok'd them immediately.
The server was extremely polite all through dinner, refilling our drinks and bringing extra napkins, etc. At the end she had already taken off the 5.00 and pointed it out to us. We were very impressed with the service (surprised, actaully, since they were beyond packed). The bill came to 77.00 for 4 people, so we left 3 gcs for the bill with 2.00, and left the tip separately.
I didn't try RFC.