We have had our 3905 for a year now and although it has not been trouble free ( it is an RV ) it has been a pleasant experience. We now travel in it full time and continue to repair items as they fail. My experience with Dutchman for warrenty issues has been overall positive, not prefect but acceptable.
Better quality control is something that most of the RV manufacturers could use, in light of that a minimum of two days living in the new RV at the dealer trying to catch all of the shortcomings would be my recommendation. When doing this I have found it is also helpful to watch how they fix anything that you do find. Sadly it does seem that all brands seem to build more than enough LEMONS to keep the forums active.
Happy Camping