Big-O,
If you are referring to Solidworks, then I will tell you one thing, I would never go back to any other software. Solidworks has so many excellent features, for sheet metal, all the flat blank layouts, Cosmos for stress analysis, and I do know they have a machining package, which I don't have since I don't use it. But I design all my stuff with it even fishing jigs and hook fits. I just would not be without it. Supposedly Pro -E is really good, but I have heard some negative comments about it. I can't say one way or another since I don't use it. But you will always have your Solidworks guys, your Pro-E guys and your Auto Cad guys.