I have a Nuvi and its great. It has text to speech, and it very accurate. All the streets around me are named. Like poster above me said, its great to hear it say, turn right in 50yards at Main St. The only time it gets lost is in the same area that my cell reception goes dead. Guess its just a dead spot with lots of trees. I didnt think I would use it much, but I do. We use it to find the softball fields each week, re-routing though traffic when the roads are backed up, to just going to garage sales on weekends. Kinda cool it that it also estimates your arrival time at your destination, and is pretty damn accurate with your speed. Apparently in Europe they have speed cameras, and Nuvi will tell you to slow down as you approach one of those areas and you are speeding.
And you can be a big nerd and go geo-caching. Which isnt as fun now that gas is a tad high.