I have an OLD GARMIN that I use for boating, and my inlaws gave us a GARMIN for the BURB on trips. I still use a map mostly as i find the GPS screws me up more than anything.
When I was flat-beddin' across the nation, I used MS streets and trips with a laptop PC.. I like the detail of planning every street. Very necessary driving a big truck. You absolutely do not want to rely on the common 'GPS' for this.