And I work with HP laptops and desktops on a daily basis so I can tell you that their failure and glitch rate is absurd (this is just one brand, I know). We tested 5 of the new 17 inch Envys which are supposed to be high end for their consumer line and they all exhibited issues including BSODs, trackpad causing the cursor to jump randomly and often, and severe heat issues under light load. Oh and battery life was awful just browsing the web and stuff (I think we got 1.5 hours). We ended up ordering a maxed out 17" MBP for one guy and will boot camp it because it happens to be a reliable and powerful machine (he had one before, just needs more power) with decent battery life.
HP's non-workstation class desktops are equally bad and is why we only order workstation desktops even for HR and others that don't need the power. We do it for reliability.
We are considering Lenovo because the noteobooks they make that we do order quite a lot of (about 20 t410s in the past 2 months) have been excellent. So we are demoing their t701ds w/quadro 3800 to see if our engineers like them. And we may switch to their desktops as well if we think they can keep up with our volume.
Probably 70% of our (admittedly small for the size of the company and number of users) IT team uses Macs (mostly MBPs) for the hardware and about the same % of us that do use OS X.
It looks like you tried hard to find problems in those HP notebooks