Looking for a Good GPS

I use a combination of a 7" Magellan, Google Nav on my Droid Tablet and A Truckers Atlas. Nothing is more accurate than the Truckers Atlas which highlights routes a Semi can drive and lists by State and route any low clearances. I bought the Magellan because it is very user friendly and I already had good luck with smaller Magellans in my cars. I would not rely on any GPS brand by its self for trip routing. I review my planned route the night before using the atlas and droid and then confirm that the GPS is following the same route just before departing in the morning. GPS works fine for major roads but is less dependable for local roads.