We got our 2015 FS last May and have logged about 15k on the odometer so far. No major issues, just little things. Some dealer fixed, some myself.
My two boys absolutely love the bunks, and they give mom and dad living space once they are in bed!!
Watch your weight, as with our family of 4, a 180lb Saint Bernard, and all of our stuff we are only left with a few hundred lbs of CCC. Loaded to the max however, we have experienced great handling. My GH exceeded my expectations and rides like my Superduty.....damn nice.
I installed a standard Wineguard Direct TV sat on mine, but wish we would have gone with the Traveler or In-motion dish. Happy with it for the price though. Check out the DIY TV mod thread, as you will want the tv to work "in motion".
The water heater is a bit tricky for showers, and my wife does complain. She has figured out how to use it though, and I'm too big for the shower anyway unless we are boondocking. It's just fine for washing and dishes, etc.
Getting ready to get ours out of hibernation for the season. Good luck with your GH. You will love it!