We have loved our 2016 321REQS and had only few problems, solvable so far. Some under warranty, some not. And a few careless awning accidents.
We still love our floor plan, love the roominess, and added the washer and dryer when we bought it. Glad we did.
We pull w a 2015 HD2500 diesel w Duramax. Never a problem, even across the Smokies back home from east coast after two fantastic weeks in Florida, and NC. Favorite trip so far.
Enjoy your new rig!