I also have a Tom Tom One 3rd edition GPS, which I got at Radio Shack for $162 incl. tax.
The GOOD: It got a satellite signal quickly. Compact, easy mounting. Easy menus, choice of voices. Seemed to have POI’s that were useful. Price was good too.
The BAD: The routes it gave me to certain destinations weren’t very good. For example, for two separate test locations (Starbucks and the Bank), it gave me very inefficient and slow routes. And I live in the city. Also, the Tom Tom One does not support Mac OSX. One thing I hated was that it had no AC Adapter, only a car charger and a USB cable, unlike other GPS products.
The VERY BAD:
When you power off your Tom Tom One and try to turn it back on, you will get the WHITE SCREEN OF DEATH. (Google this, it’s a problem many users have.) I got it too. The only thing you can do is a soft reset…EVERY time. Very annoying. And it wipes out my clock every time I do that. Also, it didn’t even know what my street name was. It always says, “Unnamed street”. (Haven’t had a chance to update the maps, but hopefully that will fix it.)
Before I bought the Tom Tom One, I bought the Nextar C3, which was a horrible choice despite its reviews. Got no signal, and the menus froze. When I called the manufacturers on both the Tom Tom and Nextar, they said they knew about these problems, but they shipped the products out anyway. Pretty dispicable if you ask me.
Out of all my research, the Garmin Nuvi 200 seemed to be the best. But It’s about 250 and I didn’t have the money. If I had to do it over, I would skip the Tom Tom, which isn’t even an American company, so who knows if its knowledge about US geography is as accurate as other companies. Good luck to you!