It really helped wheel hop and the car feels much more planted. But I don't see how someone could accept these vibrations. When I take off from a stop it sounds like I'm sitting in a 1997 Cavalier with a trunk full of subs, volume cranked and every panel rattling and falling apart.
A buddy of mine at work had an old Civic (1990?) and it had an Energy Suspension HyperFlex kit in it and I told him to start it up and rev the engine a bit. The look on his face said it all.
I'd be embarrassed if someone was in my car today.