Havn't had any personal expereince with the seats (thanks to the cost)
I have seen and priced some at a Mustang parts store here in Sacramento a couple of times, as well as looked at their stuff on their website, and thought they looked sweet! They appear to be functionally designed with nice lumbar and side support. The sport material is really nice for keeping clean. I think the 5 point harness seats are a little expensive and uncomfortable. I wouldn't want the 5-point on my crotch for a 6 hour drive down I-5, not sure how you guys feel.
But, if you plan on tracking your car and feel a $500 -$1,000 seat would benefit you, then go for it! If you are just looking to upgrade your existing seats, you may be able to find something a little less expensive that would serve your purpose. It's all in the application....
Jennifer
aka Jane of all Trades