We have been caching since September of 2009 and have only used a Garmin Nuvi 200, and we have over 350 finds so far.I did a lot of research on "paperless caching" and found several ways to use the Nuvi. Check out this link. http://geocaching.totaltechworld.com/#
We have thousands of caches loaded into our Garmin and find it very perfect for our use, but then again we live in a very urban area. We have the entire description, hints and the 5 most recent logs. We do have a premium account as well as an account with GSAK in order to make this all work. The map gets us close to the cache, and then we use the "Where am I?" feature on the Garmin that gives us our coordinates to get to GZ. We will upgrade someday in order to have longer battery life, but for now it works for us.