Hi, I saw a ride magazine article a while back, did a test on loads for accuracy etc, the top one was a Halfords Professional, got a better accuracy mark than a £250 snap on one. They are £50 so I bought one.
It has worked well for me so far for a couple of years and about six engine rebuilds on various bikes...
Oh yeah - there are two ranges 8nm to 60nm and 20 to 100 (or something) the 8-60 is a good range and means better accuracy at low torques.
Cheers, Mat.