SG-
I have a "Bullet" purchased from Island Time PC. Bob Stewart is the owner and is very knowledgeable and helpful with any questions you may have. He sets up the units with his own version of the software and you are ready to go right out of the box.
It's the basis of many different systems out there, but Bob's expertise was what sold me on his system. He sells routers as well that allow any device onboard to take advantage of whatever wifi signals youmay pull in using a network.

Excellent product-- only limitation is finding open wifi signals.