The Atheris is an attractive mobile mouse with a good optical sensor, but it's priced a tad high, and we have some quibbles with the Synapse software. Wait for a price drop.
Snappy optical sensor; Unlimited game-specific profiles; Light on power consumption; Separate X and Y DPI axes
Pricey; Side buttons too close together; Ambidextrous design; but thumb buttons on only one side; Macro editor needs bulking up; Intrusive registration requirements