I have a P72 and it is garbage. Plugged into a docking station it works OK as really expensive mid-range workstation. Trying to use it as a laptop causes the fans to spin like crazy, performance throttled to shit and the and battery life of maybe 90 minutes for even fairly modest workloads. The similarly specced Dell Precision I had before was much better in every way and was actually usable as a laptop.

The P5X series that many of my colleagues have seem much better.