TMI products sport seats

I need to re do my seats and I ran across these guys in mustangs unlimited.
They have replacement foam and covers to keep a pretty original appearance but gives the seats some support and you can add in headrests.

http://www.mustangupholstery.com/classic_mustang_products.html

if you click "classic sell sheet" on the right it gives more info.

Anyway, They look much more comfortable then stock and I was wondering if anyone has any experience with them and would like to hear some feedback.

thanks