I have an LCD back-pac for my GoPro Hero 3, as well as a battery back-pac and many mounting possibilities.
I also have the GoPro Android app that lets be see what I'm shooting as well as control the camera from my cell phone through wifi. Makes the GP easy to set up. Once set, I use the remote on the handle bars to turn it on and off, very simple with the bluetooth remote.
The GP 3/3+ black series is a huge evolution from the 2 series and 3 white/silver series.
My one complaint is battery life. So I bought the battery back-pack and three spare batteries.