HI Crakercrum
I have a 2011 Sundance 245 XLT that I bought used in 2013. I can only give you my personal experience and it has all been good. I have had no major trouble with my coach.
My one experience with the Heartland factory was when the glass in one of the overhead doors broke. Not being in warranty, I just bought two new ones. When they arrived, the were the same pattern, but not identical. The pattern was a mirror image of the original. Apparently they changed suppliers. I called the factory back and they sent me enough replacement glass to do all the glass on one side at no charge. That was excellent customer service.
When looking for a coach, your best resource is yourself. The more knowledge you have, the more you can recognize problems.
You might want to check out the PDI checklist Dan posted on
THIS thread in post #6. It has a lot of info on what to look for.
Good luck in your search.