I've fitted the powerflex kit, my car is now the tightest golf I've ever driven. I used to use the bugpack bushes but to be honest I think these are a tad to harsh (stiff) and I think it is because of this they tend to split a bit sooner than the powerflex ones. Like they sa you get what you pay for, I opted to pay a bit more for piece of mind. Either way polly bushes are the way forwar.
Hope this helps you.