I just heard about this on show 329 of the Podcacher podcast. I decided to give it a try today. Created an account and went to the nearest one- just 3 miles away. Found it easily with my GPS. I don't think I would have found it with only my phone. The app does not give you much info- no coords - so I had to get that online before I left. I usually try out new things just to see if they can be fun and add to my adventure travels. I am headed west in just over a week so may get a chance to try some more of these.