Impressive how easy to use this beacon is, especially for multiple burials. I've been using the Tracker for the past 8 years and it was good and I was very capable with it on single burials, however not very good on multiples.
I'm not any faster with the S1 because it requires the user to move more slowly. It will give you the "stop" sign if you move too fast, which is annoying at first, but you get accustomed to it. The beacon really shines on multiples. Easy to view on the screen, then flag and move on to the next.
There are other features aren't all that useful. It is nice to be able to check other peoples beacons to see if they are functioning properly.