u'll use it every now and again i do, but if you buying to read the horsepower thingy that doesnt work to good especially with turbos! doh' but its a little tricky to use when you first get but read the instructions and its easy enuf. for instance you have to have it right in the middle of you windscreen and exactly straight but its easy to figure out when its straight it has a little reading on there to tell you when its staight and when its is you just press the enter button and away you go!