i have both the magellan roadmate 500 pro and the garmin 2610.
They both have their disadvantages and whatnot.

the garmin is annoying that it loses signal everytime you go under a bridge or something and it warns you and covers the screen

the magellan tracks as long as it can then has a little indicator telling you signal is gone but the gps changes to what the next directions you need to take are. so if you really lost signal at least you have a point by point direction

the garmin i find is faster but and the roadmate has this annoying lag.

reading wise i like the magellan.

but i really think you should go to a store and try them out. bestbuy and such have all them on display to look at but can't really show you the gps functionality cause your not really moving.

but look it up.