I've been using my Garmin eTrex Vista unit to track my rides when mountain biking. I have found it to work pretty well. I attach the unit to my back pack so that it gets unobstructed view. I did find though in several instances the unit turned off but I think the batteries came loose while going over some big bumps. The LCD display is ok but ou do you have to adjust it from the default settings. I like the altimeter view and the ability to record and save tracks. I use the enclosed software but have been experimenting with using Google Earth and Google maps. I am not able to import directly from the device to Google maps but that is not a big issue for me. I do find that it does take a while for the unit to acquire the satellites and that it can have some issues when ridiing in canyons but this is no worse than other portable units I have used. I like the size and weigh and the ability to use it with one hand, nice when riding.