http://www6.tomshardware.com/consumer/20040924/logitech-08.html
"Now for the tests, to see whether all this technology really makes a
difference in real life. We compared the laser mouse with the MX 510,
the most precise mouse available as of today. We tried both models on
the latest FPS games - UT 2004, Doom 3 and FarCry. First off, I gave
the mouse to several players to try with these games and the reaction
was unanimous: the MX 1000 is better. It's not just a matter of
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precision in movement, but overall precision. This mouse reacts to
your every movement. Your hand movements correspond very exactly to
those of the character on the screen. The traditional test - making a
half-turn followed by aiming through the scope in FarCry - confirms
the impression. You gain in speed because targeting a point just after
a rapid movement is astoundingly easy. We then tested the MX 1000 on
retouching a picture in Photoshop, and the conclusion is the same.
Zeroing in on a spot with millimeter precision is uncannily easy.
And Faster To Boot
An interesting corollary of this diabolical precision is that it's
possible to use a higher resolution than with another mouse. As soon
as you increase the pointer speed (CPI), the mouse moves across the
screen faster, but you lose preciseness on small movements. But since
the MX is fundamentally more precise, you can move faster without
problems. I moved the cursor almost to the maximum (not far from 800
CPI) with a 1280x1024 resolution. Compared to other mice, you'll have
less physical distance to cover while maintaining the same precision.
This means you'll be faster on games and other graphics-based
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applications.
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The verdict is clear. Not only is the laser mouse more precise than
the preceding generation, but its general handling is exceptional.
Everybody who tried it wants one. And that's in comparison with the
best LED optical mouse on the market, the MX 510.
If you compare with a standard mouse, the difference is like night and
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day.