Nobby,
I was in Perth WA last year and picked up an AL 6000 on the recommendation of OverRun (who had purchased one 6 months earlier). It is indeed easy to use, and it looks the dogs bx. For fun OverRun and I decided to have a comparison shoot out between the two machines, and a bottle of WA's finest. To our astonishment at every stage there was 0.02 % points difference between them (i.e. his would read 0.06 and mine 0.08) for consecutive tests with the same person. I have since calibrated mine against other types and I am fairly sure that its 'worst-case' accurate (which suits me fine) and its consistent, but be aware - they don't last forever and individual machines vary.
OverRun? I think he ran his over with his Landcruiser. He was certainly in better shape than me the next day.
Pinkman