I am looking at this gps unit http://www.rei.com/product/735607#ReviewHeader and I was wondering if anybody has any experinces with it? Is it easy to use after you get used to it? I know I would have to buy a topo disc but does that show the trails? I have never used one and I have the opportunity to purchase one and there is alot of great feedbacks on this unit on the REI web site. If anybody has any other gps unit they have had good luck with please feel free to jump in.