Wheel alignment (Wheels-In-Motion)

Anyone tried these? Had my tracking done at National tyres couple of months ago to which I was told the tracking was miles out! All fixed and two months down the line tracking is back out (no bumps/potholes etc). Pondering using a company called Wheels in Motion http://www.wheels-inmotion.co.uk Anyone used/heard of these? Google discussions seem give very good reviews on this company especially fact there using the Hunter alignment tool.
Input please! :shout: