We have a 2015 3818 and love it, we spent every weekend in it from April through August this year, we also just came back from a 4500 mile trip to Colorado. I will admit it's not without it's flaws. I have had to replace the water pump, outside trim, backup camera, bedroom slide floor, as well little misc. maint. items. The floor was a manufacturing issue and I did end up getting screwed just outside of our warranty period (more of a dealer issue in my mind). After the slide was fixed I've had no issues. If you are handy and like to mill around I'd say go for it. If you don't enjoy working on little things or aren't handy I'd stay away.
The good: tows like a dream and we like the comforts/features packed into it
The bad: quality is not high on dutchmen's list, like anything else there are good ones and bad ones in the market.
Quality is on par with the rest of the industry, these rigs are mass produced and pumped out quickly. I firmly believe you will have issues with any house you can pull down the road at 70 mph!