I have been using this and it has been an amazing piece of kit! It feels different in the beginning for sure but isn't that true for all the boxes? I didn't find it being hindering while running once you get used to it.
Here are a few things I would like to mention here -
1. Order one (or two) sizes bigger size than their recommended sizes
2. It needs a different kind of jock strap (one with no pocket) so do get it with the box
3. Wear it the correct way. One can also wear it upside down but it becomes very uncomfortable soon and provides no protection that way
4. I like to wear it under my compression shorts (the box touches my skin) and you can wear it above or below the compression as you wish.