Eh, mine were more of a spur of the moment thing. I needed a better seat for the 5-points, but could have gotten away with much "less" of a seat.
I wouldn't trade them now that I've got 'em though.
The only issue I would see with something like mine is the super high sides. I wouldn't want them on a DD or something that would see any road use. It is kinda a pain to get in and out. Once in though, the butt ain't moving.
Most of us lost our seating for 4 (or 5 if you have "Keith sized" friends) a long time ago. I didn't miss not having the rear seat at all when it was still my DD. Although, this is coming from a guy that likes regular cab trucks better than extended cabs.