I've used Kensington Trackball for over 12 years. The first one lasted 10 years, and it is still working just no currently drivers for it.
K64325 is the model I have now. One of the little ruby stands broke in the ball well and I called them about it. They replaced the complete unit at no cost to me, they even paid the UPS.
Don't know about 3D, since the only way we can even see 3d is with some special equipment.
The trackball is awesome. I move the ball with my fingers, no carpal tunnel problems ever. Before I went to freetrack I used it for viewing in IL2. I got pretty darn good at it. I just set one key for Front/center and anytime I got a bit disoriented I just hit the Front/Center key.
I paid $100 for my Kensington trackball, and that is what I paid for the first unit over 12 years earlier. I think it is a bargain, knowing it will last so long and work so well.
Don't think there is anyway I'd pay $300 for a mouse unless I had extremely good knowledge of what it would do to make it worth that much money.
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