Negative things: I have a Surface Pro 4 (with the current WIN 10 updates)

Excellent, only bad thing is they wear out after a couple of years.

Love this thing... super easy to use...better than a mouse !

Love this thing... super easy to use...better than a mouse !

My old one started doing odd things like it's sensors weren't working right

Love this thing

I absolutely love this thing

The only annoying thing is the sensor in the trackball holder can get covered in dust, which requires you to pop out the ball and just blow out the dust

I love these things.

one love this thing

I love these things

I love this silly thing.

Weird thing is, when I turn the actual mouse upside down in the air and scroll with the ball, it works 100% of the time

This thing is the bomb

plus once you get use to where every thing (it's a big change from regular mouse) speeding about the computer is way faster.

Love this thing

These things break in a few months or even a year.

An odd thing

I cannot say enough good things about Logitech Trackball mouse.

Best thing ever, I bought another and recommend them to everyone!!

Weird thing is, when I turn the actual mouse upside down in the air and scroll with the ball, it works 100% of the time

Love this thing

The weird thing is this: I bought one for my wife when I first purchased

I love this silly thing.

After using it for a while, you get spoiled by not having to put up with all the annoying things that come along with a mouse

I love the feel and most things about it

I hate the pad thing on the keyboard.

Love this thing so far

It would double click on a single click and all kinds of crazy things

I love these things

These things are great

Best thing is no cord.

Love this thing

I buy some bad things sometimes, but this is by far one of the worst thing I have ever bought

Excellent, only bad thing is they wear out after a couple of years.

this thing is awesome

One thing I would like besides a left handed version is having the battery lite flash when the computer is powered down to remind me to slide the on/off switch to off

But one of the two problems I'm having make this thing nearly un-useable

My husband hates it and thinks it's the worst thing

This new one is lighter (not a good thing when you need it to not move when in use), and feels like much cheaper materials.

Only awkward thing is where the forward and backward buttons are

My old one started doing odd things like it's sensors weren't working right

I have a small hand, so if it were a tad smaller i would like it even more, but its a great thing

Several things I always wonder why the world never adopted universally:Dvorak keyboards

It's easy to use and wrist pain is a thing of the past.

Not much difference from previous models to this version, but that's a good thing as Logitech trackballs are great!I've been using mine for a few months, and there are no glitches or other issues

love these things

After carpal tunnel surgery, that's a wonderful thing

Even a few months later I still tense weirdly trying to use the mouse like a regular one

so i clean i out regularly