AF 990 feedback requested

My Arctic Fox was the end of 2012 model year run, so I'm sure reliability varies with how long a particular design has been in production. My unit changed in how the basement was built from previous years and I hoped getting a later model that year would address anything caught early on. 2005 or 2006 was the switch over to aluminum framing, so I'm not sure how much of the design was just swapped over from the wooden frames of past and how much was changed along with the frames. I try to avoid the first year run of a new product or redesign knowing there will be problems that slip by testing, but sometimes the timing of my purchase and design changes conflict. I try to apply this to vehicles as well as RV's and let someone else working out the teething pains of a new born product since this is not brand specific.