I have an Agility 3. I upgraded from 2.15 to 2.22 because 2.15 forced the drive to SATA1 speeds in my 2010 MacBook Pro instead of SATA2. The drive is SATA3 regardless. I'm not going to enable TRIM until I notice significant slowdowns.
It's been a great drive so far, Agility drives use about half the power the Vertex does idle = better battery life. I used my Pro to surf for an hour on Wifi at night (keyboard light on, screen at lowest brightness) and the battery went down 10% in just under an hour. Downside of the Agility is it's about half the speed of the Vertex series with non compressible data but it's ok. It's still plenty fast and I like my battery life.