PRO/E is great. Other modules that I use, besides the standard and sheetmetal, is Pro Cable (makes routing cables, wires, anything stringy a snap). The only problem with PRO is the same thing that makes it so great; the fact that it is parametric. Importing image planes to model from is something I haven't been able to get it to do (not to mention powerful render or animation tools). That's why I'm learning Maya. Let me tell you, though, to get my parametric left brain to accept non parametric "artistic license" from my right brain has been a challenge