Quoted:
notebookreview is pretty good, I've spent a good amount of time in the HP forums.
I have a probook 4520s. Its not bad, I got it because it was cheep after I killed my HP DV6000t. I dislike the trackpad, it doesn't have separate mechanical buttons, the pad and buttons are all one. But at least the middle click registry key still works in the new synaptics drivers.
I fucking despised the trackpad for some time. In fact somewhere on the internet is a rant where I threatened to go to an HP campus and commit arson over the issue
I finally was able to come to peace and actually now prefer it. The key is that you need to change your work habits and the way you interact with the computer.
I run the latest Synaptics driver with an assload of customizations, TouchPad Locker, and Reil's touchpad app (mainly for three finger middle click).
I wouldn't trade it for anything and when I jump on one of my other laptops I end up getting pissed because of the missing real estate and all the cool shit that I *can't* do that I can on the trackpad.