My wife and I have a Garmin. I like it. However, the traffic feature requires you turn on pop-up adds. So when it's on, you get ads for Red Lobster popping up. Very annoying. Fortunately you can shut off the traffic feature, thereby shutting off the pop-up ads as well. It just seems like, why advertise it has traffic information on it when you need to put up with Red Lobster ads in order to even use it.
Aside from that, it's decent. Sometimes it can take a few minutes to sync up with the satellite though. My iPhone used to lock in with the satellite in under 30 seconds, while the Garmin would be trying for 3-5 minutes.