If you search the "techy" section, you'll see multiple threads about GPS units, and GPS Vs Phone. Some of the threads go on for pages, so there's lots of info already there to digest. And since the same guys usually respond to every thread about GPS units, whatever they covered there already is pretty much the same stuff that'll get rehashed here. I'm not trying to sound like a dick, but if you look for those threads you'll be able to read them in their entirety, rather than waiting for responses to dribble in.
"No matter where you go, there you are."