I apologize if this has been asked over and over but I haven't seen anything lately about this so here's my question. Is a $500 or $600 (or more) GPS really worth the extra cost over a $120. model. When I look at the Zumo units the price seems kinda crazy. What makes them so much better than a cheaper model? Amazon sells a Garmin 265WT widescreen with traffic for under $120. Wouldn't this work just as well?