After using the iOBD2 cross-country (~2500 miles), I couldn't be happier! On my 2003 E450 Four Winds I can get instant mileage, average mileage, coolant temp, oil pressure, MPH, average speed, etc. It's great for maxing out fuel use! I had started with one of the more generic OBD2 readers and it didn't work, I couldn't get it to stay connected. With the iOBD2 reader, that hasn't been a problem, it creates it's own network and connects every time. I use it with my iPhone or iPod Touch. The App is easy to use and you can set up custom dashboards to display just the info you want to see, and if I remember correctly it has alarms you can set as well to warn of high temps or low volts. I highly recommend the product.
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