I do not think that anyone "plans" on taking them back. However, with these China-made clone engines it is a reality and more of a hit-in-miss as to if you get a keeper or a dud. (Personally, we have experienced 2 of the latter from HF). As to the warranty, walking in to your local HF for an exchange/refund is a lot easier (and CHEAPER) than shipping that behemouth Duromax back where the shipping costs will kill you.
Michael