fitted a set of these at the weekend and they make a good difference, reducing the amount the front of the car lifts and I believe the amount of wheel spin, the car feels like it pulls forward more, rather than up and forward....
As I've said in other threads the only problem is getting the original bushings off ...
I'd use a bench grinder instead of angle grinder to weaken the metal part of the bushing (along 2 sides of it) ,it gives you more control, then encourage it off as shown in the tutorial or in a vice. Took me about 1 hour for 1 once I had it figured plus a bit of swearing
Dave hope this isn't spamming.