We bought a '07 40PDQ used in August of '07. Previous owner ordered it, took delivery and dropped dead six weeks later. He hadn't had a chance to make a list of issues for warranty work. The warranty was transferred to us but the distance to warranty station gave me the opportunity to learn my coach from the inside out. Found good mobile tech who replaced leveling jack tank that sprang a leak and did a few other things under warranty. Overall quality was about normal for that price range unit.
No mechanical issues during nine years of ownership. We spent about 5 weeks a year in it the first four years and about four month a year during the remaining years of ownership. So, we had hundreds of days of use and about 30K miles on the road. Compared to our current Winnebago is drove like a pig. Lots of stuff came unglued and unscrewed on the coach end of things. Had a leak around the door that caused some rust issues. That big heavy kitchen slide made lots of ugly noises but never broke. Our windshield came unseated twice which is unfortunately "normal" for that model.
Still in contact with people who purchased it two years ago to full time. They had a leak in the fuel tank, a plumbing leak, had to replace a leaking bathroom window, windshield came unseated, awning motor failure, blown radiator hose and some other small issues. But they are happy with it.
I would be cautious about an '09 Endeavor. As pointed out above, HR got sloppy just before they went bankrupt. Over the years I've talked with some owners who were very happy with the later models and others that had nothing but trouble. I personally would only buy an '09 if I could talk with the previous owner and you had complete maintenance and repair records.