I haven't used this one myself but noticed that whenever I go into bike shops they are using metered wrenches to avoid over tightening. If you do end up buying it I'd love to hear how it works for you Neil! I'm assuming this would be for your bikes correct?
Court, we haven't purchased since we use either fixed handheld torque wrenches or a rather large snap-on torque wrench. The Topeak one sounds perfect for us but I just can't justify given that we have other tools that get the job done. When we build a bike, we disassemble and re-torque every bolt.