Turns out its a great tool that made the process a lot easier and more fun!
It has two sensors so you can cook two different items- or locate hot spots on a grill

The back chicken in this photo cooked a little faster than the front.


You can also chart the temps...
This is a screen shot

You can even download the entire graph as a PDF

The best part is since it connects with Bluetooth I can be in the house and still see the temps on the grill in the cookshed- and its 30 yards from the house!
Used it on the chickens, a whole hog

Ribs

And the results were great!

http://www.igrillinc.com/