Much better for the street than solid. I had the powertrix FUCA's...drivers side inner bearing failed so I bought the Z1 streets. The only thing you need to check is when you raise the front end up for repairs or whatever. The outside locknut would loosen on both arms (just the outside locknuts). I put a little red Loctite on them and put more wrench into them. So far...still tight. So just check them when you let the car down on all four before you drive down the road!