GoPro - Anyone have one, are they worth it?

[WeezyBengal]

Have a wedding coming up and am deciding whether or not to get a GoPro. I am looking at getting the Hero4 Silver which is around 400 dollars. Does anyone have one? How much use do you get out of it? Do you use it for pictures or video more? Do you have any of the mounts and which one do you use the most?

I think it would be really cool to use on our honeymoon to Aruba and I can only see us using it more as time goes on as we have kids, other vacations, go out of the country next year etc.