A friend of mine has one and its works well as a the dyno itself with out a PC, but it works much better with a PC. Its nice and small and dont need a 12v source to run it like a Fantom or other dyno's. Its good for testing at the track and you can use it at home with the PC and get a full range of info not seen on the screen. He gets all race day on one 6 cell pack too. Its well worth the money.