My MIO works all the time. Always has reception.. it just... doesn't get addresses right.. it gets you within like a block of the place.. but it's somewhat annoying to be like.. uh.... where is the building?!
It took like 20 minutes of using Google maps on the iPhone and my GPS to find my tuner's shop. Drove down this street like four times. Finally gave up and just went searching on my own. Turned out it was like two parking lots past where I was turning around at. Like I was literally turning around IN SITE of the shop, lol.
I remember when I used to find places with just an address.. now that I have GPS I feel dependent on it, and it's like I couldn't figure out how to get home without it lol.