I have the 3Dconneciox Space Navigator and I quite like it. It's really the only 3D mouse I've heard of so this is a one sided suggestion.
It lets you pan/zoom/rotate all at the same time and it only took a few days to really get used to it. The basic one has two buttons which can be programmed to do various things, like zoom all.
Ditto on Navigator - I have more advanced model too, but only use the two buttons anyhow.
I prefer to change the default zoom/pan behavior.
Ditto, the first day take motion sickness pills and get familar with the "Home" view icon. After that you won't be able to work with Inventor without a 3D Motion Controler and will wonder how you ever worked without one.
I use the spaceball 5000 (usb) with an old driver. Works fine, I find the ball more comfortable than the new ones, and they are cheap on ebay.
What OS are you using?
I have 25 of these things that I haven't been able to get to work since changing to 64-bit Win 7. (don't think I tried older driver)
They work fine on win7 64 and winXP 64 with Inv 2010 - 2013 using driver from 3dconnexion web site. Its a bit slow with fusion but not sure if that's just a fusion problem. Some other posts complain about fusion being slow to rotate with newer devices as well.
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