I would be willing to bet that one could find negatives about any camper. I have had two Lance campers and have never had a problem. I have had questions, and have had very good factory support. By the way CAD construction means more than just the design. I may be wrong, but at Lance they use computer guided machines to cut the camper pieces. That's why they no longer use gimp to hide the joints. In addition Lance has reduced the weight of their later model campers.
I would decide on the camper that I like from any of the major manufacturers and not look back.