Garmin is the best ever.  I have not heard great things about other brands, but Garmin is it!  My husband drives for a living.  We used to have to map everything onto the computer print it off, and then have him carry the maps with him.  There were a lot of places that we unclear and he would call me to check the computer again if he wasn't in the right spot.  Well.....garmin has solved that problem for us.  He just plugs in the garmin.  He types in the address and away he drives.  There are options to evade toll roads, to go only on highways, to go the shortest route, or hit the detour...