For the HP Pavilion 400 Set, I have to say that the keyboard is fine and works perfectly. However, the mouse never worked at all, so I had to get another very cheap mouse, which works just fine!!!

The "chiclet" type keyboard is very good in terms of feel and comfort. Low-profile keys allow for easy and fast typing without much effort, reminiscent of laptop keyboards (with a slightly more rubbery feel to the click).

It has a standard layout of keys, so you won't get confused, and it has a small overall size (length, width, thickness), making it very compact without having small keys (most of them). On the right side, where the num-lock and right alt keys are located, there are some changes (see the photo to understand), and it has some special keys (e.g., clear).

One downside is the small and cramped F-keys (F1-F12 and their adjacent keys) in the top row of keys, as the distances between the areas are small (e.g., arrow keys and num-keys). The compressed home/delete pgup/down keys would have been better if they had a larger gap compared to the Numeric and main keyboard, but they don't. You might miss pressing PgDn sometimes.

Also, by default, the FN layout is enabled (meaning the secondary functions work, such as increasing brightness, volume, etc., instead of the F-keys F1-F12). You can adjust their function and reverse it in SOME HP BIOS (maybe also in other PCs), but I don't know if you can do it on any PC if this feature exists. My own HP i5 from 2013 doesn't have this capability in the BIOS, so I am forced to use the FN function, which I don't prefer. However, there doesn't seem to be a hard FN-lock function, not even with combinations like fn-shift. Personally, I prefer the classic f-keys (F1-F12) to perform functions like refresh (now I have to use FN-F5), instead of the special functions, but some people might find this layout with FN convenient. In the default layout, to press alt+f4 (window close), you actually have to press fn-alt+f4. This might be a small inconvenience for some, but for programmers and old users, it could be a deal breaker.

The left Ctrl key is missing in the Greek version (it doesn't look like the one in the photo), and in its place, there is a strange < > symbol in Greek or | \ in English, which are symbols that can also be produced from the classic positions. I don't know if this facilitates anything. I would prefer to have the Ctrl key, even if the left one is not frequently used. The good thing is that it retains the "right-click" key, which I personally use in many cases.

There is a "clear" (non-standard key) that clears the field (like a delete field), and it is a bit more convenient. It doesn't have a Num lock (it is always num lock, and in its place, there is a shortcut for the calculator, which is a good feature). Around that area, you will find other "different" shortcut keys (e.g., minimize all). See the photo.

It doesn't have extra feet to raise it higher, but it has a moderate incline that is okay.

The space key is okay but not perfect.

I find the mouse in the set cute (beautiful), but not particularly comfortable.
- It is decent but hard plastic.
- The grip is average (not an ideal shape. I would prefer the back part to be higher, but it is like a "turtle" with the center being the highest point).
- The scroll wheel is decent but small.
- It is hard/typical for its price category, and it is quite noisy (which doesn't match the relatively quiet keyboard).
- It has a proper weight.

If you find the keyboard alone at a cheaper price, there is no reason to prefer the mouse unless for the sake of uniformity. HP has also released better mice, but this one is also manageable for simple use. Personally, I decided to use it with the (relatively affordable) b110 silent mouse from Logitech, which I find to be a good match as a whole.

In summary, I would give it 5 stars (good chick-let feel), but I rate it 4 stars due to the default FN layout of the top buttons instead of F (F1, F12) and the inability to change it on most computers, as well as small gaps between groups of keys (you try to press the left arrow but end up pressing the "modified" Ctrl which displays > < in the Greek layout) and strange options/changes on some buttons compared to classic keys.