Kind of an old thread, but I have been using my UG now since last July and it has been a huge help in chasing down many of my OBD woes, not to mention all the handy information it provides on the fly. Something that hasn't been mentioned is the ability to see the IM readiness monitor tests. For anyone living in a 'smog check' zone, this is a very handy feature to use the UG to see if the car is ready to pass it's 'smog test', and can save time not to mention money, as it will tell you when the ECM has completed the test. Quite a lot of utility for $70 bucks. It has paid for itself many times over in the few months I have used it.