I just bought a vista c. I love the size of this thing. It is TINY. Easy to use, gets a great signal, and the software is easy and intuitive. The compass feature is nice. They claim it uses extra battery, and as such they have a setting to turn the compass on and off depending on how fast or slow you are going for a given amount of time. For example. "turn on compass when speed is below 3 mph for 15 sec." all of which values you can change. I love the thing. In terms of maps and memory. I really don't often download maps, just cache waypoints. But I have been told that as long as you don't download a really dense area, for example maps from washington dc to new york city, you'll be fine.