Pros: I bought this mouse to replace the wireless iMac mouse. It was too small for my hand, and I found it cramping up occasionally. This mouse is the absolute perfect size for my large hand. The buttons are well placed, and I love the ability to switch the mode of the scroll wheel. Also, I realized about 2 months after using it that the scroll wheel actually clicks to the left and right, allowing for more versatility without slapping more buttons onto it. Overall a very good mouse.

Cons: When the scroll wheel is set to free scroll, sometimes it drifts a bit and scrolls when I don't want to. I don't use this mode very often for this reason. Only when I have to scroll very fast very quickly.

Other Thoughts: I only use this mouse for work, not gaming, so I can't attest to its use for that. As an everyday non-gaming mouse, it suits me very well.

Pros: as long as this mouse is available it will be the standard-issue mouse in our office. It is very comfortable, works well and looks pretty sharp in an office setting.

Cons: I like my mice to have a little weight, but not "loaded full of AA batteries kind of weight". that being said I wish this mouse was about 15-20 grams heavier.

Pros: Buying this mouse for a 4th time. I like the ergo, and the hyper scroll is great for database use.

Cons: Used heavily daily. Lasted 2 years. Motion is now jumpy...no longer smooth. Love this mouse when new.

Pros: I've had two of these mice. The first one lasted a few years with heavy use. I bought another because I liked the first so much. The second one has lasted longer but I use it less often. I would buy another if this one failed.

Cons: None

Pros: Great hyper scroll feature
Very nice ergos

Cons: Tile feature of the scroll wheel could give you a bit more feedback once you use the feature. Sometimes I feel that I did not actuate the mechanism as the user feedback is minimal.

Other Thoughts: Great mouse that I use every day for work. I work a massive spreadsheets and that hyper scroll feature really helps out tremendously. Also great for web browsing.

Pros: Price

Cons: After using the M500 for 6 months the wheel down button is almost impossible to click. When pressing down it clicks the side buttons before clicking the down button. Its reverse from what should be normal. Many times you will hear the click when pressing down thinking your locked on only to find out it was a side click.

Pros: Mouse just works. Cord is long enough for just about anything. Nothing wrong with it at all (unless you hate corded mice and you have no reason to be reading this review)

Cons: Nothing

Other Thoughts: Works great, has not lost its brand new clickity feel after about a year!

Pros: Great ergonomical design, programable buttons, laser prescion, tilt wheel, additional software for programming. . . What else do you want.
I my line of work I have mouse in my hand 8 hours a day doing 3-D design. A comfortable mouse that fits your hand, and has programmable buttons is very important.

Cons: The right click (press-hold, and drag) feature died after a year and half. I can still use it, but a gentile hand is required. I have to settle, and find my happy place, and slow down a little while utilizing Autocad Inventor.
Although that is why Inam here, to buy another one. This will be my third one. Please don't stop making them. On second thought, I might buy two, okay three. Love this mouse.

Other Thoughts: Get 'me while you can. I love the corded version, I don't have time for delays.

Pros: Works great. I'm a big fan of forward and back buttons on the side of the mouse when browsing the web.

Cons: I would prefer a model without the physical toggle for the low-friction scroll wheel mode, but I don't dislike it enough to take an egg off for it. It is sometimes in my way when I scroll or click.

Pros: Love the ergonomic shape and thumb buttons. Bought it to replace a years-old MX518, which has a similar form factor, that had finally given up the ghost a few months ago. Seems responsive enough. Good cord length (some of us still want our mice to have tails!). Nice, smooth feel. Quite professional looking. I loved the old MX518, wanted something similar, or at least something with a few extra buttons, without the crazy transformers-on-steroids gaming mouse look.

Cons: The "tilt wheel" is... just... terrible. There's a toggle button right behind it for whether you want it to spin freely or normal, uh, clicky-scroll mode. Seems pretty gimmicky to me, but I guess maybe someone, somewhere has a good use for the "just fling the wheel with wild abandon, reach the bottom of your forum thread 73% faster!" mode. When in wild abandon mode, it's extremely sensitive, and like others have said, tends to move in random directions just by looking at it sideways. Lock it into clicky-scroll mode, never look back.

Even when in clicky-scroll mode, the wheel seems very loose, both side to side and front to back. Like it really wants to be in wild abandon mode.

I don't really like the side tilt thing, either. To just plain middle click, I have to very deliberately try to go straight down, because if my finger does the normal middle click muscle memory motion that it's done for the last 20 years, this mouse interprets it as left tilt, not middle click, and nothing happens. I think I could get into the side tilt thing if it weren't interfering with middle click.

Other Thoughts: In an attempt to fix the side-tilt-middle-click thing, I thought I'd try to maybe install SetPoint and customize the buttons. If nothing else, give up left tilt by mapping it to the same action as regular middle click, so that movement would work more reliably for me. Bad idea.

My mouse and keyboard are going through a KVM, which worked fine on its own with standard Windows drivers. But once I put SetPoint on, it did something terrible and everything completely locked up. Locked up for several minutes during install but finally came back, so I restarted like it wanted me to. Then it would lock everything on the login screen, couldn't get anything to work, couldn't get to Safe Mode, couldn't do anything. It still worked just fine on the other computer (via KVM, but hadn't installed SetPoint there yet). And if I pulled the mouse out of the KVM and plugged it in directly, it worked fine. Can't give up my KVM, so I finally uninstalled SetPoint. And then spent another 20 minutes methodically removing all traces of it, because a simple uninstall wasn't good enough, still locked everything up when running through the KVM.

Back working now. KVM is more important than middle click. So I got that going for me.