not really, at the end of the day its just a bit of metal to add reinforcement. i've got one but fitted it when i fitted my coilovers so couldn't tell you the exact improvement it makes. but one of the reasons i bought it was because they stopped making eibach ones for mk2's, so i got one quickly and now they are like rocking horse sh!t!!! oh and they look lush!
for that price though you can't go wrong, you will see the benefit!