I had bought 2 sets of keyboards about 8-10 years ago at the ridiculous price of 64 euros for BOTH sets, from a Greek store with a 3-year Microsoft warranty.
It takes some time to get used to the shape of it, the mouse, at least for me who prefers larger sizes, didn't help me at all, it's a bit tiring and it's unacceptable for such an expensive mouse (40 euros alone) in 2023 to be missing the < > forward-backward keys!
It also takes a while to open tools with a left click, half the time.
After a year, the rubber surface on the sides started to have a disgusting feeling in the hand.
With the prices that exist now, I wouldn't buy them for anything, because they're not worth it!
I understand paying money for a mechanical keyboard, but paying for a keyboard of this construction category that has a fake nylon membrane instead of mechanisms, it's not worth it at all, cheap things (made in China) with a nice design are being sold to us at expensive prices!
With very moderate use, after three years both keyboards became useless, because one short-circuited the transmitter so the whole set becomes useless, and in the other one, two important keys stopped working and I gave up on it.

I have bought 2 of these keyboards, one for home and one for the office. They have their positives, which are quite strong, but unfortunately, the negatives cannot be ignored.

The positives:
- The batteries last for 2 years on the keyboard and about 1.5 years on the mouse. In general, they are not battery-consuming, especially if you have rechargeable ones.
- It has a very good ergonomic design that doesn't easily cause fatigue and also helps with fast typing. It will take a few days to get used to it, but then there won't be any issues.
- The keys are relatively quiet and quite durable.
- The mouse is good, the keys haven't worn out, and the side button provides some good functionalities.

The negatives:
- The most important one is that the USB receiver breaks very easily. At first, I thought that the mouse and keyboard were starting to malfunction because if you stopped using them for 5-10 seconds, they would freeze. Later, with the second set, I noticed that after three or four times of removing and inserting the receiver into another device, the second set also started to have issues. Now, I was able to fix it because I know how, but this is not possible for the average user, let alone for a product that is supposed to not require repairs for something faulty.
- It doesn't have LED indicators for Caps Lock, Num Lock, Insert.
- The FN key is not a button that you press or adjust to be on or off, but a switch.

Overall, it is a good set, but the receiver should not be constantly plugged and unplugged because it easily breaks and then there is a delay.

I got this specific keyboard for one reason only... the double Space+backspace... which helped me immensely in typing and browsing.
Good construction, not too bulky... the wrist rest after 4-5 years (I don't remember exactly) started to wear out on the left side where the hand rests the most... the keys do not fade, they have the same slightly hard feeling when pressed... with short travel distance and profile.
The FN switch is stupid and a half... just like the lack of LED for NUM LOCK, CAPS LOCK... Every time I have to search to see if I'm in Greek or English... I consider it an unacceptable stinginess... for a 48-50 euro keyboard... (fortunately there are programs like CapsLock Indicator that display on the screen if you have NUM LOCK, CAPS LOCK on or off) In general, it's worth it...
UPDATE... After 3 years of heavy use, it suddenly stopped working, so I got a new set with a mouse... the keyboard remained the same without any apparent changes. The mouse is decent-sized and relatively low in height, with a glossy top and some rubber on the sides... the blue touch button is useful for scrolling back and forth on pages... the scroll wheel is slightly hard without free scroll (to the point where I'm thinking of putting back my old Logitech MX...) I hope it lasts another 3 years!!!

I have had it for 6 years (EDIT of the comment I am doing now, January 2021) and normally the keyboard is for 5 stars but I put 4 because it is relatively noisy. Especially for someone who writes a lot and fast and... non-stop, it may even annoy anyone in the room. Personally, it doesn't bother me though. Apart from that, its feel and response are excellent and the overall build quality is great. Also, with the front feet raised, it is indeed a very comfortable keyboard. I don't know why the other friend complains that his fingers hurt... Personally, I write for a minimum of 10 hours a day and I have no problem. Neither have the keys faded as another friend claims. Not even one bit! Also, I turn it upside down and hit it a few times to get rid of dust and I am very satisfied that despite the endless "abuse" I have subjected it to for this purpose, it is still there, intact.

For around 65 euros that I see it comes with a mouse, I consider it a very good price and worth it, even though I had bought the keyboard alone for only 35 euros (from abroad) and the only reason I would ever consider changing it would be if I decide to have a silent one. Otherwise... don't even think about it, it is the best keyboard I have had in the 25 years I have been working daily on a computer.