I will say they work Great for me!!!!
I just recently retired from Street racing in N.Y. In 05'to 07' I won 11 Street races against some faster cars and that's because i was HOOKING HARD in the Street due to the Caltrac's with Stock multi leafs and cheap Summit adjustable shock's... I just upgreated to there split mono leafs and 9way adjustable shocks....
by the way, I had a 1.40 60' at the time in the track....
I know it will be a better 60' foot time this Summer with the Split leafs and shock's ....