I have an official NFL football I bought about 30 years ago and it has seen better days. Plenty of scratches from street pavement and, because I used to keep it in my car for convenience, it got pretty dry and lost that tacky feel. So I bought the Wilson prep kit to see if it would bring the football back to life.
While it did not turn my football a rich dark brown like some I've seen pictures of on the internet, it did restore it to look about 80-90% new. It did not completely remove the scratches (they were pretty deep in a couple of spots) but it definitely made them a lot less noticeable.
My one complaint is that it did not really bring back that original tacky feel as much as I'd have liked. It IS a bit tackier and easier to grip than it was in that dried out condition it was in but it wasn't as sticky as I hoped it would be. Maybe another couple of treatments will get it to be a bit more tacky. Otherwise my football is almost as good as new again.