Terrible. I got one back in April, and threw away the packaging, because I didn't think I would need it. My family had had Logitech mice for a long time, so I wasn't worried. I plug it into my computer the next day and the entire mouse glitches out sometimes. Even if you aren't touching the mouse, the cursor moves in circles and in random movements. Then, about a month ago, I bought another one, this time Red. I saved the packaging, and I am glad. My mouse stopped working entirely. It's plugged in to the computer, with a fresh battery. The mouse is turned on, but it doesn't move the cursor. Will I buy a Logitech again? Probably not. But if I do, it certainly will not be this model.
Every wireless keyboard should be solar! I don't see why Logitech would make any wireless keyboards that require batteries again.
I've had this keyboard for over a year and the battery level never went below 100%.
Design wise this is a great keyboard, slim, lightweight, looks great on my desk. I would recommend this keyboard for anyone that plans on not using it, and wants something pretty to look at on their desk. I am attaching actions shots of my keyboard in use... not charging. I believe the sun might be broke since the keyboard has been in the sun all day and it still does not work.
Unfortunately I can't use it because of it's awful battery design. I have been through 2 batteries and the unit simply does not charge my keyboard. Good news is I no longer have the receipt to get my money back!
I've had this keyboard for about 10 months and I absolutely love it. I've never had an issue with it. It is small, sleek, excellent tactile feedback, and works precisely as is should.
I work in an office without windows and medium lighting and it works perfectly. As other reviewers noted, there is no caps lock light. But that's a very small issue for me.