I have an Explorist 200. It deleted POIs on its own. I sent it back and they sent back a 200 with firmware version 2.1.25. So far so good. It was probably a firmware glitch. If you only do a few geocaches a week, it's fine. The map function is somewhat useless except when on an airplane. Then its cool to see where you are. All in all, I am happy with the 200, especially for the price.