I honestly had no idea HP still made laptops — or that they were still in the consumer hardware business at all.
The good points are that's fast enough for my job (mostly backend web development) and easily expandable. I eventually maxed up the RAM to 32 GB, replaced the HDD and DVD with 2 SSD, replaced the keyboard (this is the 6th year of the laptop) and I know I could replace the CPU and the GPU if I care. It runs Ubuntu well.
Somebody could dislike its 3 kg and the 0.8 kg power brick, its thickness and the about 3 hours battery time but they're less important to me than expandability and the 3 buttons touchpad. I work from home most of the time. By the way, the battery apparently didn't lose any capacity along these years.
https://www.ifixit.com/Device/HP_ZBook_15
The newest models improved on many of the good points and some of the last ones I wrote about. The keyboard still has the number pad. I'm considering a 14" model to get rid of it.
The weight is a massive pain, 3.3 Kg for mine, but on average I take it somewhere once every couple of months at most so I can live with it.
The big plus is that I haven't had to buy a new machine in close to 5 years and performance is on par with my Dell at work and certainly better that my crappy surface book 2 at my previous place.
Though I have to say that the ability to open it up is less than ideal.
Because of a leaky water bottle and a surprisingly waterproof bag I managed to soak my week-old laptop for about 12 hours.
There's only two screws on the bottom, and they're covered by rubber feet. The problem is that only two of the four rubber feet are removable - removing the other two breaks a clip, meaning I had to superglue them back on.
After drying it out over the forced-air vents of a server-room for a few days, it was a-ok.
The zbook is just garbage. Hot garbage. We had all of them fail due to woefully inadequate cooling. Only 2 are still working (out of 10)
The elitebook 820g2 is better. I have the only surviving one there though.