I just picked up a new 2011 15" MBP on Friday. The plan had been to swing by BB and get a 500GB Seagate Momentus XT Hybrid Drive and a spare drive enclosure. I wanted to swap the stock drive with the Momentus XT. I bought my MBP from a local mac specialist called The Mac Experience who agreed to install the drive at the same time they upgrade the stock 4GB RAM to 8GB. The first Momentus apparently was DOA. They couldn't get the MBP to even recognize that the drive was attached. They tried hooking it up to several other machines and had the same problem. So, I ran over to BB and returned the drive for another one. With the second one that had slightly more luck but had to go through the process of downloading the new SD 24 firmware. They were able to get the MBP to see the second drive enough that they installed a copy of 10.6. However, when the tried to reboot the MBP it would not boot from the Momentus even though it saw the drive as having a bootable drive. They would click on the drive and it would just hang. How much luck is everyone else having with these drives?