Quality won't be a problem. Rex posted a
YouTube factory tour which shows how they build. There are a few other video walk throughs of different models, though not of the 600.
www.youtube.com/user/NorthStarCampers/videosCustomer support is also second to none. While shopping for a used Northstar I shot some questions to the factory and they were as helpful as if I had just bought the camper new. The used deal didn't work out but I did end up buying my Adventurer new and dealt with Rex from custom configuration to delivery. Just before the warranty period on the converter was up, mine died. I described the problem to Rex and he agreed. I told him I was both willing and capable of doing the install and he shipped a replacement that day.