Very rugged and very easy to use! I have a Samsung and a Spade &Co. Samsung I don't need no app. Spade &Co the app SUCKS! It doesn't stay connected and it doesn't reconnect like it should. I also do not like the interface,. Carbonix is definitely a superior watch in my opinion! Battery life is out of this world. Especially compared to my Samsung I was charging every other day. Carbonix I'm getting 12 to 14 days.