3G WiFi Routers have long been offered in high-end Maybachs, but Cadillac has brought it down to a much more affordable level by offering it in their CTS Sport sedans. With a solid 3G connection, you could be looking at a speed of around 400-800kbps, but with a 2G connection you’ll probably get around 200kbps. Your car’s speed may also affect these numbers.
Currently, only 1GB and 5GB plans are available (for $30/month and $60/month respectively) which really isn’t that great, especially with a large majority of phones available with unlimited data plans for a fraction of this cost. There’s also the $500 investment of buying the router, which makes it a bit of a low bang-for-the-buck value.