I have a 12'6" SUP and would be happy to talk about it. I think I've answered you off the forum so if anyone else is interested, I will answer other questions ON the forum. Please jump in!
Briefly, the board is great for paddling, and I've sailed it with 5.0 and 6.9 sails on light wind days (<7 knots). I have not yet had a chance to paddle/surf with it.
There is the SUP forum for more answers too.
hope this helps,