While I don't have the specific model you are looking at, I have the 3950 HD edition. We had our fair share of teething pains, and through friendly persistence we were able to get everything corrected by the factory. My few dealings with the Heartland group (via the forum) were all positive and it's my belief that if you approach the issues with a positive and non-aggressive attitude you can get a lot done. They essentially redid my entire inside due to some interesting design flaws. After 4+ years and over 25k miles we still love it and would buy another. They are heavy beasts but the 1 ton dually seems to handle them fine, I've towed through Colorado (Wolf Creek Pass), LA, Florida, Sturgis, etc. No problems that weren't my own doing.
Good luck, let us know what you settle on!