The left-handed MX610 feels far more comfortable than the hockey-puck-style mice that come bundled with most computers. Though it fit our (female) hand perfectly, we suspect those with larger hands might find the mouse uncomfortable. As with most Logitech mice, clicking the MX610's main mouse buttons demands a bit more pressure than we are accustomed to, which can sometimes lead to finger fatigue. Nevertheless, during our use the MX610 responded flawlessly to all our clicks and movements, and we didn't experience any tracking errors. The lights promptly alerted us to incoming instant messages and e-mail.
Logitech backs the MX610 left-handed laser mouse with a lengthy five-year limited warranty that includes replacement or refund if the products are defective. The company's support Web site offers user forums, a knowledge base, and an e-mail form to contact the company.
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