Remember, it's not only KwikFit that have these machines, and I know of at least one Lotus specialist who uses them. I've had my geo checked twice on a Hunter Machine, by KwikFit, with no damage to the car, or the wheels, whatsoever. The Hunter brain had all the correct specs for an S4s, I checked them before they started the job. I didn't have any adjustments carried out, just the check because I feel KwikFit is not the best place for that, they're more 'get it in, get it out' merchants. Perhaps you should give it one last try just to underline how inaccurate those infernal lasers are, though