Bests & Worsts Reviews from Amazon

This is the first ODB scanner I have owned. I bought it yesterday to check my daughter's car. Her Check Engine light was on. And the car is very important for her livelihood - but she is also on a tight budget. Rather than running off to a garage I thought it would be good to know just what was happening. (Oh - and I've wanted one of these for years. Not that that had anything to do with it ;) ) Good reviews. Same day delivery. (Checked the reviews with my new friend reviewmeta! Thanks planet money podcast). This unit was easy to use. Found a misfire on cylinder 3. We pulled the spark plug. Tightened and cleaned the aging gap (and ordered new plugs!). Cleared the code. Checked again. And she's good to go until we can replace those plugs this weekend. Despite a few setbacks of our own making we were done in about an hour. And yes, if google is to be believed, if the misfire had gotten bad, her driving with the check engine light on MAY have ruined her engine. So this little purchase may have saved her car.