Bests & Worsts Reviews from Amazon

I bought this device because I have three older vehicles, a 2004 RV and 2010 and 2012 sedans. Within a month of owning it the check engine light came on and I was able to see that is was catalytic converter or O2 sensor. A quick google found Cat Cleaner and so far the light has not returned. The car has not other symptoms like poor mileage and the tools allowed me to watch the O2 sensor to know it was not defective. My only complaint is reported MPG. I know that it is inflated, but I also know that is not the fault of the device but the car's systems. I do wish the device was a bit shorter. It gets in the way a bit, but if it lasts, bigger is worth it. the previous ODB2 reader I had (another brand) only lasted 6 months and the replacement another 6 months. I am hoping for better with this unit.