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This review is from: Razer Naga Hex Ergonomic MOBA Gaming Mouse (5,600 DPI and 11 Programmable Buttons) - Green (Personal Computers)
The Hex uses a Phillips twin-eye sensor and like many of these sensors has a "feature" that is sometimes called "dynamic dpi scaling", which cannot be disabled at this time.
What this "feature" does is drop the DPI at low movement speed and so makes precision work a bit hit and miss. In a game if you turn fast then unless you land bang on your target there is a chance that when you then try to move the last few pixels the DPI will have dropped and so you might have to move further than you would have thought to close the gap.
I cannot use a mouse that has unpredictable movement, no matter how good the rest of it is, so back it went.
This isn't the first time I have been caught out by buying a mouse with this "feature", and I did give it every chance to see if I could get used to it even though I have experience of not being able to get used to it on other mice. I now know to avoid any mice with a Phillips twin-eye. Having been caught out by three mice with it, hopefully it won't happen again.
One other note, it is a small mouse. I don't even have that large hands yet it felt a little too small for comfort. So there is that to consider, even if you can get used to the DPI feature.