Metroplex,
My refurbs showed up about two weeks after I had verified (using the IBM RMA web page) that they received my dead ones, one shipped via FedEx, and the other arrived via UPS...
I really hope you get 120GXPs in return, I have two 80 GB 120GXPs in my main rig and they are very quiet and noticeably faster than the 75GXPs. No problems with either of them...and I'm sure if you google search you should be able to find HD utilities that test must deeper than IBM's DFT tests. But I figure if my refurbs could withstand two solid weeks of non-stop DFT testing (the advanced tests) without any errors, then they would be alright for use. And so far, no problems...