Since the MS model is hardly seen only at a few sites when found the Logitech Marble mouse is getting a chance here as a spare and for replacing the thumb scroll type a friend is slow at replacing.
(takes one name off of the shopping list anyways! )
When you get older and fully grow and find yourselves with larger hands over the years you will understand why some mice feel "tiny" when you go to use them. This is why I mentioned earlier about "preferences" seen not everyone has the exact same size hands and comfort with any one style or type of mouse.
The Logitech model there is programmable and simply grabbed as a spare while the MS model preferred here is no longer made and hard to find at times. For the next person an MS or Logitech mouse won't make the grade. Like you said you wouldn't recommend the marble type for gaming since you have your own preferences. Finding one that best suits your personal and offers smooth scrolling is always the plus there.
hmmm. how about the logitech g7, or the g7. Wait, maybe the g7? Did i mention the g7? lol.... the g7 is great. bc its wireless. and its a g7, so that is a +...haha
Logitech has one cordless model seen for $99.99 retail with two scroll wheels believe it or not if you like wireless and a thumb button that doubles as a scroll wheel along inside a recess along with the typical scroll wheel seen on the top center. That one is the MX Revolution not 518 seen at http://www.logitech.com/index.cfm/mice_pointers/mice/devices/130&cl=us,en