1. A little strange work on bluetooth with Apple devices (Macbook and Ipad): at first everything is fine, but after about a month the connection breaks and refuses to connect, the pairing break and a new connection help. With a PC (connected via adapter) there are no problems. Perhaps the problem is in the Apple software.
2. If you look at the keyboard at an angle, you can see the light from under the keys. Ugly. Without backlighting, the keys, as rightly noted here, are very pale, I personally feel uncomfortable. The backlight itself also works very strangely: when idle, it goes out, and in order for it to light up, you need to bring your hand to the upper edge, lightly touch the edge or press any key. In the first case, the sensor does not always work correctly. It would be better if they made it possible to independently select the operating mode, for example, "always on / by sensor / always off" (with a firmware ate, the sensor began to work better).
3. Traditionally poor software from Logitech: Options does not normally support high-resolution screens, everything is buggy on Win, I didn’t even install it on a poppy. It’s not the first peripherals of this company that have such jambs, before that there was wireless game mechanics, so it was even worse there.