I wanted to post my experience with the 17" Quad 2.3 installing a 120 gig 6g SSD from OWC. When I purchased the drive, I wasn't aware that there were issues using the Sata3 channel in the primary (or secondary) bay. I was installing this in the primary bay to replace the 750 gig drive. FYI this machine has already been upgraded to 8 gigs of ram. I installed the SSD with very little difficulties. FYI, Apple has done a great job making this installation easier and easier over the last few revisions of the MacBook Pro. The latest model makes drive removal/replacement a snap, using one fixed bracket on top instead of two. The design was really clean. Once I installed the drive, I installed a clean image of Lion and was having intermittent beach balling problems. The drive itself was fast, but the beach balling was driving me nuts. I even wiped it and started over before I started checking out the forums and discovered a known issue using Sata3 on the 17" units. My system was purchased the day the units were released, so its the earliest of the early units. OWC sells a shielding kit for ten bucks that basically wraps the Sata3 ribbon connector in an attempt to shield it from EMI coming from the battery (directly next to the HD.) For fun, I opened the system last night and shielded the ribbon cable myself using Aluminum Foil. The ribbon has several elbows, and I wrapped one segment to the end of the elbow, then the next segment, etc. I reinstalled the drive and rebooted. I have used the system for about twelve hours and haven't had a problem since. The system was beach balling several times every ten minutes. Now the system feels much more responsive. It was booting in about 25 seconds before I shielded it. Now it boots in 11. So far so good.