A great road force balancing machine:
http://www.hunter.com/balancer/roadforce/index.cfm
I find it amazing if you can drive 3 years without needing to change tires...
I track now, so I change tires every 2-3 months, but even before I tracked, I changed tires at least annually.
I don't personally understand how one can get more than 10-15k miles on a sports car...
My van got 60k miles on its tires...but that's a van lol
You can always request black color weights.
Also, I have never seen weights on top of weights... they should have just used a heavier weight.. that's unprofessional imo
Also, you cannot place wheel weights in a location where it might look "prettier"
You place then where they need to be to balance the wheel
One of my current Volks has no wheel weights as it was mounted and balanced perfectly, but this is a rare occurrence.
if you want, take the weights off and see how the car handles at about 80mph... you'll forget about how ugly they are and be upset at how horrible the car drives.
You should go back and tell them to do a better job though. stacking weights isn't good imo