We have been doing electronic scouting since 2013. We set up a Bluetooth network with tablets (one tablet per robot). We also keep a few tablets charging at all times and one in the pits. There are ups and downs. The ups are obviously realtime data (and a heck of a lot of it). The downside is the human element. We are a small team, so wherever we go we partner up with other teams to help scout. The downside is you have to train people as well as deal with mistakes on input. Someone had likely made a mistake when they said we went under the low bar in autonomous (we can't fit). Additionally, several high goal shots are missed in the first match we shot high (kind of disappointing). However, for the most part, we get good data. Here is our app:
http://innovators3138.org/Fires16/CS/#!/
Additionally, we leave the data open to all who wants it. It's the analysis of the data that we keep private (though admittedly, there's not much to it).