I use Lion's Filevault 2 on an early 2009 MBP and have not had any crashes or stability problems at all. FV2 on Lion is light years ahead of the broken Filevau

I use Lion's Filevault 2 on an early 2009 MBP and have not had any crashes or stability problems at all. FV2 on Lion is light years ahead of the broken Filevault 1 (Snow Leopard) implementation.