Does anyone here use a 3D controller such as any of the models from [3Dconnexion?|http://www.3dconnexion.com/index.php] I used one of their entry level controllers at a CAD conference last year and it's advantages over a traditional mouse weren't readily apparent to me for MEP drafting. My employer is hearing good things about them at the SMACNA convention, so I'm willing to keep an open mind. It just seemed to me in the few minutes I had to tinker with one that it would be better for products like Inventor.