I used powerflex for the rears so im no help, i cant see the superpros being better mind...the powerflex are pretty damn stiff!

Just some useful information on the difference between Powerflex and Superpro versions. The Superpro bush retains the OE passive rear wheel steer (something to do with the grooves on the outside of the bush) whereas the Powerflex version gets rid of it. I have driven cars with both fitted to them in my previous job and the Superpro bushed cars are a lot more predictable at speed.