Just tried out the Dev preview of Lion (latest build) and TRIM is not natively enabled for the C300 SSD. On my SL partition if I use TRIM enabler, it doesn't really work...after a while TRIM seems to get turned off. However on Lion, it sticks for weeks, so I am making the assumption that TRIM will be either natively supported in Lion GM or permanently enabled with TRIM enabler as I have it now. The more you know.