I have a Nuvi 260W I purchased about 8 months ago and it looks to be pretty similar, just a smaller screen and MP3 doesn't work, but otherwise the same basic unit.
I'm fairly happy with it overall; the built in battery life is decent and it is very easy to use. The voice navigation works well and the screen is excellent. It has a lot of neat extra tools included that I will never use. Even in Alaska it knows where 90% of businesses are just by inputting the name, though 10% of the time it does not know or says they don't exist within 60 miles while you're sitting in the parking lot (i.e. Taco Bell).
That said, it isn't always the smartest unit. While it is very good at finding streets, if you want a house number on a street it is hit or miss. More of a map issue but not a big deal. Most of the time it will put you within a block of the actual location but sometimes you can be as much as a half mile off.
However what's most frustrating is that it is can be really dumb about choosing routes. It does good at long distances but in town it sometimes chooses paths that make no sense and a few times it has really screwed me up. It will make a stupid mistake like ignoring an offramp that exits 500 feet from where you want to go, and then like a stubborn old man it will lead you on a long looping course for an extra ten miles through seedy neighborhoods where you risk being shot before finally arriving around the block from your destination twenty minutes later, all the while proclaiming "this is a shortcut I swear".
I would say it has properly guided me about 80% of the time. The convenience factor is awesome, no more printing out maps from the internet. If someone calls me with an address, in most cases I can go straight there with the GPS' aid. But in situations like where I drove to go see a car in Ward, AR and "arrived at destination" 90 miles away from the real Ward, AR thanks to the GPS, a laptop with a wireless 3G card really helps to verify the route beforehand...
I will let you play with the Garmin when we go to the Superlift park if you want.
