I've had one of there maps on my old polo 1.9tdi 100bhp they ended up mapping it to 150 ish bhp with something like 340ftlb of torque it destroyed the clutch within a week and half and that wasn't driving stupid. They said they never mapped a polo like mine before so I'm guessing I was a test dummy, so from personal experience AVOID!!!!! Also a friend's dad had it mondeo st tdci done by them and the figures were way under what they quoted when he went and got it dyno'd.