The aluminum containment seats can be adjusted for the height of the ears. Nice to set it so your eyes peek over the ears while your head's center of mass is still supported.
Haven't found a really comfortable aluminum seat yet though, haha.
I have a Racetech seat and its' head restraint arms are pretty long. That along with me being short makes the passenger mirror useless. It also make exiting the driver's window very difficult. It is a pretty comfortable seat and seems much safer than my last seat.
Here you can see where I mounted a race mirror in order to get some idea what's next to me or soon will be.