How reliable are the Hunters alignment or does anyone on here operate them?

I took a CRV in for a couple of rear tyres and thought I'd get them to check the alignment.

Received the printout and it looked like it was well out with the before and after diagrams. Got in the car and the steering wheel was too far over to the off side and it pulled to the near side. Took it back and once again had a printout saying it was way out Had it done again and although it straightened the steering wheel it still pulled to the left.

Took it back once again and they changed both the front wheels over and it still pulls to the left.

The car drove pretty straight in the first place without any pulling and the steering wheel was spot on. I wanted it checked as my other cars was out and the inside of the tyres were shot.

Are theses device fool proof and it's not the operater screwing it up? I have a print out here for what it's worth showing everything seems to be lighting green and ok. Im back off there again today because as far as I'm concerned it's worse now than what it was to begin with.