If the primary purpose is on-road navigation, particularly with auto-routing, the 276c....uh....sucks.
Seriously, I love mine, but if I had to use it for finding my way around town, I would hate it. The nav feature is terrible. It seems to consistently take me WAY out of the way, or if I take a detour (due to road closure, traffic, etc), the damn thing continually tells me to turn around....with no option of "take a detour"...I have to figure it out on my own by turning the auto-routing off.
I do really like the screen size, color, contrast...the space between the buttons (making it easy to operate when wearing gloves--on the motorcycle--), etc. It is a great unit....unless your primary purpose is navigating around town.
Fortunately, I don't use that **feature** much. But if you do, I'd suggest some other GPS.