This is a great product, and highly recommended for those who like information about their car and their driving.  It does have a couple of flaws, but the company has great customer support, and is making regular improvements.I first used this on a 2001 Olds Alero.  This car was easy to set up using the in-app instructions.  In this car, the app takes all of the data from the speed.  Since it judges breaking based on deceleration, I occasionally get a false breaking signal.  It is uncommon, and acceptable.After a couple of days, I removed the device and moved it to a 2001 Ford Escape.  At first, I was unable to set-up this device on the car.  I filed a problem report with Automatic, and they responded within 24 hours.  They downloaded a new code to the device, and it worked flawlessly.  They followed up with me daily until I replied that everything was working right; great customer support!  This car had an engine light, and this device not only provided fault codes, but it let me know each time that the car registered a new fault code.  I can see that this might be annoying to someone who typically ignores engine faults!  The device sometimes gets loose, which causes an intermittent connection.  I can fix this with a little bit of tape to tighten the connection.-I really like being to review past trip data.  It plots the course on a map, using the phone GPS.  It puts markers next to any activity.-Right now, there isn't much room for customization.  You can't change the high speed signal (set at 70mph).  While 70 might be a good limit in Minneapolis, it would be annoying in Denver, where the speed limit is 75.  While you can't change the speed, you can disable the sound.-It calcuates the gas spent assuming regular grade costs in your area.  If you use premium grade, it will under-estimate your costs.  Another area that could use customization-I hope they are working on some parental (teen drlver) functionality.  I think this has great potential for parents trying to train good driving habits with their kids, and also keep a track of where they have been.  My kids are 10 and 11, but when they turn 16 I'll be looking for something that can provide metrics on accellerations, breakings, speed, etc... A parent-account where I can log in and see my kids statistics would be great!