I guess I'll go first...make that second.
My initial thought is that this appears to be a pretty slick product. I like the idea of eliminating the four studs hanging out the bottom, but I've never had an issue with them contacting the rocks (I know some wheeling terrain will certainly cause this to happen) and am not convinced that it has $500 worth of value to me. I'm sure there are a lot of people that will greatly benefit from this upgrade.
Is this upgrade related in any way to a 5 or 6 knuckle stud or ARP knuckle stud upgrade?