Pros: For the first 11 months it worked great even though the tilt wheel was not supported by my KVM.. all other functions worked as expected.

Cons: Left mouse button started double/multi clicking after 11 months of use. Logitech will not support replacement or repair of the mouse saying that they don't recognize the part (PID) number.. I see that several people have had this issue with other Logitech and MS mice to the extent that there are "repair" videos on you tube about trying to fix the spring issue in the micro-switch. IMHO a mouse or keyboard failing after less than a year of use should be warrantied by the manufacturer.

Other Thoughts: Logitech says that the PID on my mouse is not recognized in their system. If this is not a true Logitech device, perhaps someone should be tracking down where these really came from??

Pros: Bought this for my laptop because using the touch pad drives me nuts. Worked fine out of the box,plug into a USB port and away you go. If you don't need an expensive wireless mouse with bells and whistles then this one will work fine.

Cons: None yet..........

Pros: If you build a computer you're likely to have one or two old-fashioned PS/2 ports. Getting a PS/2 supporting mouse will free up a USB port which you can use for something else.

Cons: None

Other Thoughts: Great mouse and PS/2 support a plus!

Pros: None compared to other available devices.

Cons: This is not a retail item. I got the mouse in a cardboard box that looks like it should be packaged with a PC system. There's no way to know if the item is actually new. There's no literature with the item. I know what Logitech sells retail because I have another mouse (B100).

Other Thoughts: Not particularly honest of Newegg to be selling things like this with no details in the advertising.

Pros: Cost. Very inexpensive, yet it does what I need it to do.

Cons: Very light weight. (compared to my old mouse) But..I'm already getting used to it.

Other Thoughts: For 13 dollars I'm happy. I just plugged it in and I was good to go. There's no snazzy bells and whistles, it's just a basic mouse. But if you're like me and that's all you need, you can't lose for that price. I'm happy with it.

Pros: Inexpensive and it works good. Has a good look and feel. Having both the USB connector and PS2 adapter is a big plus.

Cons: None

Other Thoughts: I bought this mouse as a throw down mouse to use when I am working on friends machines and it has served me well. You never know when you will need a PS2 mouse to test out the mouse port.

Pros: Light, 800dpi

Cons: Middle mouse button difficult to press down, Not precise.

Other Thoughts: The mouse is light and has 800dpi, that's a plus. By the way, the cord is not thick as others have suggested.

This is my first Logitech mouse, and my last. It takes some effort to press the middle button down and you must use the software for the extra button functionality.

It's darn near impossible to draw straight lines with this mouse without lots of 'jitter' in the pointer. That kills this mouse for me, and from doing much searching, it seems to be a big problem for all Logitech mice.

As someone who needs to edit photos, I need precision and I can't get that from this mouse. I decided to go Logitech because I was tired of the failure rate of the left click on Microsoft mice, but at least the Microsoft mice were accurate.

Can't win for losing.

Pros: works good

Cons: none

Other Thoughts: its a mouse

Pros: Great basic mouse + tilt as a bonus. Good feel and accuracy, tracks respectably well on surfaces it probably shouldn't (ie: blankets, fabric, pant leg, etc). Still supports PS/2 operation, which is always a plus for me.

Cons: I can't get the tilt wheel (tilt left/right) to rebind reliably at all in most applications (in Win7 64bit anyway). Wouldn't be a problem except finding information on logitech's website - specifically a FAQ or anything specific on the B120 gives no real information about it except that it exists. Setpoint software doesn't really clear anything up either - does it really support the B120? Or are you choosing the M110 black? Are they the same mice? Who knows? There's no technical info either, other than a marketing bullet-point that says 800dpi.

Other Thoughts: I really hate to dock an egg for this mouse. Honestly the mouse itself is great. And my problem with the tilt wheel not working as forward/back (SeaMonkey, Firefox) might also be the application's fault. Internet Explorer works fine with the tilt wheel with this mouse. Other logitech mice I have with forward/back work fine with both Seamonkey and IE. So is SetPoint not correctly "remapping" the tilt right/left to forward/back? Or does Internet Explorer also just interpret tilt left/right along with the "traditional" forward/back as such? I have no idea... I only nitpick cause I really like this mouse, and never expected something so simple like this to not work.

I've sent feedback to Logitech a few times on this, since it seems such a simple thing to fix or add as a feature, but no response over two months. Oh well... I wonder if the RX250 has this problem also?

Pros: Good while it lasted. I had reviewed this shortly after I got it and given it 4 stars (it lost one for the thick, stiff cord)

Cons: -thick cord
-middle button died after about 6 months. Scroll and horizontal scroll still work, but the middle button function does not.

Other Thoughts: I have generally been quite happy with Logitech mice and keyboards in the past. Hopefully this is just a fluke