Used one on recent lumber runs to Maine, upstate New York and western Pa. I emailed Steve, my co-pilot, as it's his wife's GPS we used. Brought us door to door everytime. Beats the snot out of Google maps etc.
Here's what he said when I emailed him:
Tom Tom One XL.
Had a Garmin on the boat, and was less than enchanted with them when it needed service.
Good unit, but their CS left allot to be desired.
Also had a Garmin PDA with GPS, and it was so labor intensive to use, it's been sitting on the desk for 2 years.
No doubt Garmin has improved, as some of my friends have newer ones on their boats, and they're nice.
We went into Best Buy, and asked to speak to the most knowledgeable guy there.
Told him that my wife wanted a good sized screen, touch pad, and ultra simple to use.
He said, well the one you want is the Tom Tom.
That's all i have.