I bought this because I needed a wireless keyboard for my PC that was pretty good looking and was fairly inexpensive. Looks-wise, I'm very happy, the keyboard is very minimalist and not bulky at all. I like the keyboard shortcuts along the top for controlling music, audio, and opening your calculator. Key response is fine as well, 4.5 stars on the keyboard itself.
If I'm being really picky about the keyboard and had to give a negative, the keys aren't as easy to press as some keyboards, so it's probably not ideal if you're planning on doing a lot of typing. Additionally, the rubber non-slide pads on the underside of the keyboard are only on the bottom and the keyboard is pretty light weight, so it slides a little on occasion.
The mouse is another story for me. I find that the movement is not as smooth and consistent as I'm used to with my logitech mouses. I use a logitech mk520 at work, and had been using a logitech m325 with my laptop. The only way I can describe it is that the movement doesn't feel as fine-tuned. I had a hard time quickly moving my mouse and stopping to click on smaller check boxes or icons. I adjusted my mouse speed to try and account for this, but it didn't help.
Overall, happy with the purchase, but I'm not using the mouse that came with the keyboard, so I'm forced to use 2 USB ports on my PC. Not a big deal at all because it's a tower, so I'm totally content with my purchase. If I could go back, I would probably just spend the extra money and get another logitech mk520 instead.