Are there any trackball manufacturers other than Logitech or Kensington who make a trackball that has most, if not all, of the following design specifications:
- Large ball to be manipulated by the fingers rather than the thumb.
- Buttons that serve the purpose of left-click and right-click that operate with the thumb
- Scroll wheel
- Scroll wheel accessible with the thumb
The Logitech Trackman meets the first three criteria, but not the fourth. The newer Logitech marble trackballs all place the ball under the thumb. Kensington products (at least those that I have seen), lack three and four.
At this point, I am seriously looking at buying an old MS Trackball Explorer off eBay for in excess of $250.
Are there any alternatives not on my list that might be effective and below that price point?