We own one and love it (2015 303) They have the very best customer service! We live in CA but bought ours at Windish RV in Longmont, CO.We had second air added because we travel,and live, in hotter climate; one air would not be sufficient for our travels. The heater works almost too well. We find that using the fireplace works for us when we are in main living quarters. Right now we are camped along N. CA coast for Christmas and have mostly used fireplace to stay comfortably warm. We did have warranty issue with wheel bearing seals but they covered the work fully. We have put about 5,000 miles on our rig and that has been the only issue. You are welcome to PM us anytime if you have more questions. I would also recommend you check out the Grand Design forum;you will get a lot of good information and feedback from other Grand Design owners. Good luck to you.