I've been a fan of tracking my mpg/miles driven, etc from my car for a while.  I've had various OBDII readers that would display the data in real time or hook up to a device to show the data.  The automatic takes this a giant step forward in a lot of ways.You install the OBDII reader into your car, and link it with your phone (and in the process with your online Automatic account), once that reader is synched with your phone, it will now automatically connect and upload whenever that phone is in the vehicle when driving.  This means you don't have to connect it, hit any buttons, open an app -- none of that.  It just works.We have the Automatic Links in both our cars, and my wife and I both have iPhones.  Either of us can drive either car and it automatically picks up and uploads the data.  It doesn't matter what phone does it, because it is all synched back to the same automatic account, very seamless.Now the data you get.  It will log by week how far you have driven, your mpg, and your driving score.  The score being one that is calculated from three different variables.  Time spent over 70mph, hard braking, and hard acceleration.  The unit by default also 'alarms' when you do any of these items in the car -- the alarms/notifications can also be turned off if desired.There are a few features it offers that we haven't had to use yet, the crash alert is one, but when it detects a hard accelerometer movement indicating a crash, it notifies your phone, and then uses your phone to call a call center and notify them.  You can also have phone numbers listed to be notified as well (in addition to emergency services).  Keep in mind since the Automatic Link relies on your phone for all the data, if your phone is not in the car, gets broken, doesn't' have service, etc none of this works.  The other feature we haven't used is the Code Reading feature, basically if your check engine light comes on, it can show you what the code was, and potentially in a more human readable form than just the code itself would.  Nice thing to have if you don't already have a code reader, or don't want to go to an auto parts store to do it.What are the downsides?  The biggest one is that it relies on the phone for GPS data and service.  This can slightly reduce your battery life on your phone (although haven't really noticed this, even on extended trips), and if you don't have your phone, it doesn't record any data for you.  The other downside is that all this data is sent to Automatic, and currently is only available via the app itself.  This means you (currently) do not get aggregate reports of monthly driving, average mpg, etc, you have to manually view it in the app.  Hopefully Automatic comes out with an API or even a web interface to view your data.  For those privacy concerned, you are essentially uploading all your car routes to their servers, distance driven, etc -- which may be worrisome for some, and I am assuming the data is also sold in aggregate (meaning anonymized so they couldn't identify you) describing driving patterns etc.Overall it connects very well, offers good features, and some unexpected things (we often look back in it to see how long it took to get somewhere -- although can be a pain looking through each week to find something), if you are concerned about privacy you may want to reconsider, and my personal hope is my data I put into Automatic becomes more accessible/exportable in the future.Update on 3/14/2014: Automatic now integrates with IFTTT and has a web api that developers can easily hook into.  This is a great start to getting your data out of their eco system, or working with the eco system to make/create new apps.  So essentially the portability/exportability is now here, with a full API!