When Tony got mine on the diagnostics, it also required adjustments in all angles. I don't suppose the production line have the enthusiasm that Tony has.
As expected, you can set one wheel up correctly, but when you change another one, the first one is now misaligned. Tony goes round each wheel continually until they all line up and the PC display goes from all red to all green.
It was obvious that mine was incorrect because the tyre wear, whilst not too serious, was showing indications that it needed attention.
However, I also didn't notice any difference in 'the drive'. But again, maybe that is because I tend to take it easy also (most of the time). :)