For those who want some more insight on the user's opinion of crashworthy seating, I would recommend looking at Michael Durant's In The Company of Heroes. Durant is the US pilot who was shot down and captured in Somalia, and he describes in detail the stroking seat, which he believes saved his back. Yes, most of us do not risk being captured by enemy forces if we cannot exit our aircraft after a crash, but the benefits exist no matter what type of flying we do.