First, on the lowest level they raised the car about 1 1/2 inches, too high for my liking. The brackets hang so low they interfere with the exhaust on some cars. The slot the bolt slides in takes a bolt too small for my nerves. A bolt sliding back and forth is going to wear on the bolt or the slot.
The ride was extremely rough with this set up and was too rough for the street in my opinion.
I was not confident enough to use them on a track so I wasn't able to check their claim of a tenth in the 60 foot.
I believe many of us were skeptical about this product so I have to say I would not reccomend for a street or street/strip car.
I do like their export brace and monte carlo bar though.