I am in the market for a Spaceball for my C2D iMac. I'll be primarily using SolidWorks and Unigraphics under windows. I understand these spaceballs can be used for other non-CAD programs... but I'm not really sure what they would allow you to do in regular programs that a regular mouse would not. Can anyone share their experiences? I just recently found 3dconnexion's Space Navigator and it appears to be compatible with Windows as well as OS X. Can't argue with the price either... USD59 (CAD69). (EDIT) Link added: http://www.3dconnexion.com/products/3a1d.php Does anyone here have any experience with this model or perhaps can recommend an alternative? Oh ya, I'd like for it to look nice too (if possible)... wouldn't want to ruin my otherwise nice iMac setup. Thanks!