Success! I finally did it. Took out the SuperDrive from my Late 2009 iMac i7, and replaced it with a 256GB Crucial M4 ($180). I used the caddy from the ebay link, which was $20. Installed and don't have any issues. I'm getting full 3gb/s via SATA, no fan issues and no issue with recognizing the drive. I did have some observations. 1. You don't need suction cups to remove the screen. It's held by heavy magnets, so a credit card or fingernail will do. 2. The caddy might not fit snugly in the old SuperDrive enclosure, so I only used two screws to secure instead of four. 3. I removed the temp sensor from the old SuperDrive, and just attached it to the caddy for the SSD. I thought it would be better on metal, like it was on the old drive. Thanks for all the info and great tips in this thread.