Man, I just like the thought of having a rollbar, because I dislike the thought of being T-boned... regardless of track times. It's not like getting into the back seat is easy anyways, and it's already uncomfortable once you finally crawl back there, so a simple 4-point rollbar isn't going to change the use of the back seats any. What it will change is the outcome of getting hit by a drunk driver slamming into your driver's side door at 45mph when they run a red light because they are day-drunk at 1pm on a Sunday afternoon. Yeah, rollbars are awesome.