For a steel worker or someone with larger hands the MS Trackball Explorer which is an optical model moves quite well. But it's far from what most would even consider using. Logitech uses a tilt wheel now to replace the trackball on their's. MS did away with the TE due to complaints about ergonaumics or whatever from the angle you have to hold it at.
As far as the Headsh0t "joke" you can get a good look at one article on it seen at http://www.extremetech.com/article2/0,1697,2024687,00.asp If I want something with a pendelum on it swinging from above... To compete with the G5 Microsoft came out with their own "lead ballioon" seen in the Lazer Mouse 6000 which is priced low for obvious reasons at this time. http://www.newegg.com/Product/Produ...TT=26-105-183&CMP=KNC-overturesmx&ATT=product
As far as the Headsh0t "joke" you can get a good look at one article on it seen at http://www.extremetech.com/article2/0,1697,2024687,00.asp If I want something with a pendelum on it swinging from above... To compete with the G5 Microsoft came out with their own "lead ballioon" seen in the Lazer Mouse 6000 which is priced low for obvious reasons at this time. http://www.newegg.com/Product/Produ...TT=26-105-183&CMP=KNC-overturesmx&ATT=product