I have had the Vette Brakes composite springs on my car since about '91 and have been very happy with them. It has not been a powerhouse until about 5 years ago though. No signs of problems still. At the track it is low 11's, high 10's with 1.60 60' times. They seem to be fine, but I don't know about the benifits in handling or the such since I was in high school when I got them and pulled the stock monoleafs out. It was night and day difference then!