Last week I got my early 2011 15" MBP. I installed the Crucial M4 256GB in the main bay right away, along with 8GB of ram. I tested the drive with diskspeedtest right away and got 270 write and 490 reads. But after a few hours of adding apps and moving some stuff I never was able to hit that write speed again. It seemed I lossed about 7-8% write speed, which is still pretty impressive. I checked it a 3 - 4 times a day for the next 4 days. I installed Trim support enabler 2.1 this weekend. I did the erase free space after installing. Boom-- I got back my 8%. I have added 20 GB of Apeture library and I have removed 10GB of iPhoto. Every time I run disk speed test I get 270+ write. With out it I was 240' - to low 250's. My thoughts are that Apple (Lion & 10.6.8) included Trim with all their SSD (samsung, toshiba). Lion is made for Trim support. I took a very small sample but I like what I have seen. I am leaving it on for the duration.