So you have just bought the S5 and now an active version is available. It has the same internal specs except it is now shock proof. That means you can drop this and all should be fine afterwards. It is has an active hardware button that can be changed for whatever you like using the most when you are outdoors. It also has some extra software as shown in the video below.

Personally I think I prefer the normal S5, but for some this will be perfect.