Very good keyboard for everyday use and ideal for someone who wants to have a computer in a home cinema !!!

I have a black one that I use daily in the office (without a mouse on the computer) since 2011, it has never let me down! I also have a second one in the living room for the TV, which has endured the kids' abuse and works flawlessly! Very good range, unifying receiver (you can connect a compatible mouse with the same receiver!), I highly recommend it!

Amazing keyboard. It works great with both Raspberry Pi 3 and Android boxes. Completely plug and play. Endless battery life (only needs to be changed every 2 years with normal use on an HTPC). Durable construction and satisfactory range of over 6-7 meters for sure. Anyone looking for a keyboard should also check out the Plus version, which is its replacement, and I believe it will have a better touch.

A keyboard purely for professional use and not for home use, as I believe it is very basic and quite small in size for desktop use. For wireless use in a home media setup, there are better options available at a better price.

I rate it as a professional tool only.

From the purchase of it.. It turned out to be faulty in the "Space" key... occasionally in other keys it presents the same issue and generally its keys are very hard. The touchpad is overly "sensitive", you "caress" it and it performs a "click" and its peripherals towards the end do not execute commands :(

Positives
-Size
-Battery life
-Very good touchpad
-Very good price for wireless
-Very good signal range
-Fairly good typing feel

Negatives
-Nothing

In general, it is a very good wireless keyboard.
I give it 3 stars because:

1. It is overly "sensitive" to the touchpad. Just lightly touching the touchpad triggers a click.
2. It does not have a USB port to connect an extra mouse. If you are not familiar with touchpad laptops, it is not easy to "click," perform drag-n-drop, etc.
3. The battery (AA) does not last very long if you use it constantly on a daily basis.

Without having had any other similar keyboard in the past, this one seems very good to me. It has excellent responsiveness in the 4 meters that I use it. Some extra buttons it has are very functional. It also works properly on Windows 10. Finally, I had lost its USB receiver and Logitech replaced it for free without even having the purchase receipt, which is very important since the USB receiver is three-quarters of the price of the whole package!! So the company's support is impeccable! I highly recommend this product!

Very satisfied with this specific keyboard. I have been using it for a few months now on my living room HTPC, and due to the full-size keys it has, I can comfortably handle the computer even for typical desktop applications when I need them. It has excellent responsiveness, but I imagine that the fact that the USB receiver is plugged into a front port of the HTPC case with direct line of sight also helps.

Positives: Very user-friendly and fast keyboard. It has all the functions needed such as scroll, zoom in/out, volume on/off, etc.
Negatives: It only works in a straight line and without objects in between, otherwise it gets stuck a lot. Many times it doesn't work at all.
Overall, to work perfectly, you need to handle it up to 3-4m, after that the range is lost and also be in a straight line.
For example, using it from a couch over 5m, there is a problem, as with all wireless keyboards.

Very good and my own experience. I am a demanding user and I have several wireless sets in my possession. In some aspects, I dare to compare it to its big brother, the DiNovo Edge, which cost me much more. The K400 has fast response, which was important for me, and it is lightweight for use on a couch. I was impressed by the functionality of the touchpad (scrolling, zooming, etc). It does not lose its connection with the adapter (bad experience with MS) and the battery lasts much longer than I expected. I will purchase more pieces from this specific one. I highly recommend it!

Very convenient keyboard for living room HTPC, small in size, lightweight, and with a multitouch touchpad. The only drawback is that using the Function keys (F1, F2, etc.) requires a combination of keys.

Good build quality.
Great range (tested up to 6 meters).
Accurate trackpad and multi-touch.
Very useful multimedia keys and practical.
I have connected it to PC (Windows 7 x64 bit), media players (Appstreamer by Crystal Audio) and to my phone (via OTG on LG G2) and they all recognized it without installing drivers!!

As an owner of three such keyboards, it is obvious that they are my choice. Both for Windows 7 and Windows 8.1, they are excellent if you have a Media PC.

A small issue with the unifying receiver (the USB you plug into your computer) that may not have good reception in some USB ports is simply resolved by changing the port. Otherwise, they have endured so much mishandling (I also have two children who use XMBC/Kodi on a daily basis!) that if they were going to break something, they would have done it, but they still survive!

The keyboard is very supeeeerrr :D
in OS windows 7 (32) it was immediately recognized and worked perfectly with all keys like plug n play
all multimedia keys work flawlessly !!! the touch pad is perhaps better than many cheap netbooks! Excellent for use in the living room with a pc connected to a large tv!!!
construction from Logitech of excellent quality! I have it for 4-5 months with moderate use and the battery it already has inside has not run out yet!
very satisfied with the keyboard!

It is small and comfortable to use. Logitech, luckily for us, thought about the possibility that we might want a keyboard for simple multimedia use, and that's exactly what they did. It also has a trackpad, which I consider important.
It has a slot on the lid for the USB adapter, so when it is not being used, it can be placed in the slot to prevent the risk of losing it.

Excellent, especially for use from the couch. Comfortable for typing, slightly smaller than the size of the keyboard most of us are used to, and with very good battery life. The only downside is the USB adapter which, due to its size, must always be kept on the PC, otherwise if you lose it, you're in trouble.