You'll find someone who has had a bad experience with all of them, but for what it's worth, I work for a small company (under 100 people) that has stuck with HP laptops for a long time; no one is telling them what to do, no corporate policy interferes, so if the reliability experience was not good they would have simply changed by now.
The only other thing to say is that I find that that the models that are available on the HP site are not always easy to find in their chosen retailers, so the online shopping experience is really very weak compared to sites that allow you to configure online what you want - and you rely on what is in stock from 3rd party retaliers. It seems only a few models are available online direct from HP.