Doesn't feel cheap like other keyboards. It is solid, and has some weight and doesn't feel too much cheap plastic. (I don't care if they placed stones inside, the weight just feels right) I've read a review somewhere which says the spacing between the keys is a bit small, I find it the opposite relative to my previous keyboard. Typing is quite enough in a good way. Some others are quite but that's because the keys are soft and their pressing doesn't feel accurate. This was is precisely how I want it to be, typing is rather quite, but key press still feels accurate and not loose. (keyup feedback is also very responsive. I love the the back-lit - Elegant and doesn't look like a Christmas tree. However, during the day when my room is fully lighted, I would have expect the back-lit not to be turned on, this is just a waste of a battery life. I would have expected the back-lit light sensor to be more sensitive (or less) and detect better when there is enough light in the room and there is no need to turn on the led. (Maybe the sensor is fine, and it was just designed to be on where there is enough light, I don't know) I Generally not a fan of wireless keyboards and mice because of the need to replace / charge batteries. I chose this one because of the USB charging option. I'm not fully happy with the battery capacity, I would have expected it to last longer, because of the smart back-lit turns off automatically. Personally for me, it doesn't really matter if I need to re-charge every several weeks or months - Because the USB charging make the task easier. You can also keep the keyboard / mouse connected to USB because the micro USB connection is placed in the right place so you can still use it while charging - But this probably will shorten the life time of the battery. As for the mouse, it is very comfortable. I've always used cheap mice which where smaller and not too ergonomic, this is a big change for me. I love the thumb rest. Accuracy is very good and responsive. I have another wireless Logitech at work and you can actually feel the delay caused by the wireless connection - Not with this mouse. Mouse design if fantastic, I just love the black-grey-silver, also very elegant and feels expensive (Well, it is expensive) There is a little problem with the middle button click. Sometimes when I click it, it doesn't really being pressed well. It seems the middle scroll button have some places which are easier to click, I guess it something I need to get used to. I'm not sure how to explain this, but if you place your entire finger to click it then feels a bit stuck (You don't here the familiar clicking sound you expect to hear). But if you click with the tip of your finger on the middle button, it is being pressed fine. I don't think this is a defect with the mouse I've received, I heard on another youtube review about this "problem". I'm not too worried about this. What actually happens is when you're using your entire finger, you sometimes move the scroll a bit left / right before clicking it (Because the middle button has also horizontal scrolling), and it doesn't seem the button is clickable when it is tilted to the sides. But when you click with your top of your finger you usually click straighter and it clicks fine. I'm guessing I'll get used to it and middle clicks will happen more naturally the more I'll use it. When I opened the package, one of the keyboard keys were out of its place, I was a bit nervous about this because I thought the the quality is poor and the key is broken. (See attached photo) Happily the key was not broken and I just placed it right back. Quality seems good, I haven't faced any keys popping out and it seems there are all sitting well in their place. I'm not exactly sure how it happened, because the packaging was good enough, maybe the key came out during the packaging. So, why 4 stars and not 5? 1. Expensive. (I think it is expensive even though I bought it on black Friday deals) 2. Even though it is not a bother to me because of the USB recharging option, I would have expected the battery to last longer for a keyboard & mouse in that price range. This might be more critical for other users. I'm a bit paranoid and I prefer turning off the keyboard and mouse while they are not in use.