We have had our 2014 335 for 3 years and put about 30,000 miles on it. Our major use of the unit include January through mid April to escape the cold weather. We just returned home from a month in New England and the maritimes. Add to that a week or two at a time visiting the kids, a few days for a fall color tour, and you'll have a good idea of how we use the unit.
In the time that we have had the unit, we have not experienced any ongoing issues. One design issue that has come to our attention is the conversion of the couch into a bed. It needed a supplement the cushion to create a flat sleeping surface. It also deploys in such a way as to restrict bathroom access. It is a minor issue, but just be sure any guests are good friends or family.
Enjoy your new motorhome!