I have had my Blue-driver for 4-5 years now, I like it a lot. It logs data, scans codes, and emails them too. Only thing I don’t like is if you’re logging data then answer your phone or text, or open up any other app it will stop logging. It won’t run in the background. Other than that it can leave it running and monitor your temps, A/F ratio, speed, etc while you drive. I’m sure there are better stuff out there now though but I haven’t bothered since this works fine for me.