I had a Hudy set up station & yes a great bit of kit when a car is brand new but in my opinion an absolute waste of time when a car has slop in it, i found it very frustrating to use, as measurements would change at the slightest movement. and running on most rough uk tracks our cars develop 'slop' pretty quickly.
also if you measure camber with a guage the tyres need to be glued spot on all the way round the rim otherwise the camber reading is not true