Have you noticed crashes and general instability on OS X Lion + Filevault 2?
We've tried it on a Core2Duo Macbook Pro (early 2007) and MacBook (Mid 2010). We've seen lots of OS crashes (Macbook) and general performance issues when running XCode (Macbook Pro).
We're also running virtualization software on the Macs (Parallels and VMWare) - I'm not sure if they're interacting with Filevault 2 (shouldn't be).
Just wonder if anyone else has noticed this.