Hi, I know that some people have experienced problems with kernel panics on Lion when running MP1,1 and upgrading to 2,1 firmware resolved these problems. I just discovered that I have one of those rare MP1,1s with non-standard firmware (MP11.005D.B00) and as a result cannot easily upgrade to 2,1 EFI. I already purchased X5365s but not so sure about the upgrade now. Is anyone running Lion on MP1,1 with x5365 CPUs and original EFI (MP11.005D.B00 or MP11.005C.B08)? What are your experiences? I'm using the machine for typical tasks, like browsing/mail/ms office/lightroom and I also run a couple of important windows apps via Parallels. I would rather stay on stock CPUs than see system crashes, so any feedback that will help estimate my chances would be greatly appreciated!