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I bought this mouse earlier this year when it was exclusive to Best Buy and before the blue one was out. I've been very happy with it so far. Very quick & responsive. Best mouse for gamers and quicker and more reliable than wireless, with no need for batteries or recharging!! Set-up was a breeze. I like the forward/back buttons on the side and the customizable buttons on top, makes surfing the net easier and more fun. My sole complaint is it lacks the little red LED my old microsoft mouse had, but that's just a cosmetic/design issue. The MX 510 is very smooth and fits my hand comfortably. Amazon has a great price w/ free shipping too! Highly Recommended.

I mean, I've been comparing Logitech MX 510 Performance Optical Mouse and the Microsoft tilt mouse, but this mouse recovers the fact that it can't tilt, but only on spreadsheets do u need t hat ability.. u can change between documents without using Alt+Tab!! wow

Having been a computer gamer and user most of my life, I've come in contact with many different mice. The mx510 is the best.

The design is the same as the mx500, mx700, and mx900 series, a somewhat tried-and-true style. The forward and back buttons (on the left side of the mouse) are close enough to use easily, but aren't in danger of being accidentally clicked. The up and down buttons (positioned above and below the scrollwheel) take some getting used to, but are useful enough to outweigh this. The up button *isn't* the most natural button, but I'm able to click it with my forefinger easily (despite reviews to the contrary), and my hands are average sized.
The switch application button seems to be the only downfall of the mouse. It isn't as easy to reach as the other buttons and its usefulness is questionable. A friend of mine with the mx700 (same design, just a little older and wireless), however, swears by that button and says he couldn't be happier that it was included. Even in the case of someone who doesn't like it, it really doesn't take away from the mouse; you'd don't have to use it if you don't want to.
Note: I would not recommend this to anyone that uses a mouse with their left hand.

The optical engine is newer and supposedly better than the older mx500s and mx700s. I, however, haven't really noticed a difference, having used an mx700 before. Despite that, it's amazingly smooth. I have heard people online and in person complain that it "jerks" or is "twitchy," but I'd venture a guess that most of those people either do not have quality mousepads or have incorrect sensitivity settings in their OS. One person who mentioned the twitchiness to me in person showed it to me, and then was surprised when I fixed it easily by turning on "Enhance pointer precision" and lowering the sensitivity. The mouse will track on virtually anything: fabrics (if you're using a laptop while sitting on the couch), just about any hard shiny surface (that traditional trackball mice have difficulty with), plastic, paper, metal, you name it.

The software included is easy to use and has never had a compatibility issue that I've seen. Remapping *any* of the buttons to a variety of different controls is easy. For example: I was able to map the up and down buttons to "next song"/"last song" in Winamp, which is one of the coolest things I've seen a mouse do.

Overall it is a wonderful product and a great deal for someone looking for a new, stylish, light, and feature intensive corded mouse.