It is popular, and regarded as definitely powerful enough to do serious engineering work. However some see this software as having a fairly unintuitive interface (such as a reluctance follow common interface conventions that modern computer users have learned to expect). Since the 2002 release of Pro/Engineer, that is called "Wildfire", the software made great progress with the GUI.
Pro/Engineer is one of a few CAD-software products that is available for various Unix-dialects, Windows and Linux. All data is exchangeable between these platforms without conversation.