I just RMA'd a stick of Crucial 256MB ECC REG. PC2100, I sent it off today. I paid to have a new stick sent to me and have my card credited upon recieving the bad stick. I should have my new stick on Friday, mine is for a mission critical server, but I have 3 sticks left in the system to get by on. They were great over the phone, didn't give me any problems what so ever, just sent me out a new one with hardly even any questions. Easiest RMA I've ever had to do.