1. The backlight, it shines from under the keys and hits the eyes, it's more annoying than functionally justified, you can turn it off to save battery power.
2. The battery, wheel, and backlight are consuming battery furiously, I charge the keyboard once a week or two, depending on the time of use.
3. Dead software, it seems to give customization and freedom of choice, but again, you can only choose from the list of AVAILABLE functions. You cannot assign your script. The backlight setting is reset very often.
4. I am a digital artist and I use a Wacom intuos pro tablet, I moved all the hot keys to the tablet, I decided to try the wheel in Photoshop . forget about the wheel in a word, it seems that the wheel developers themselves did not use it in multitasking mode. As a result, it only needs to change the sound, but there is no function to turn it off completely, the software pop-up infuriates, and without software, the keyboard does not work in full mode.
5. There is no activity indicator on the Num Lock key, which is in the previous manufacturer's keyboards.
6. If you try the wheel, oh yes, how loudly it switches from a smooth ride to a step mode, a crunch or whatever it is, xs, until the last I thought it was a marriage, no one talked about it in a single review on YouTube, because that everything is bought, even small bloggers. It is a pity that Logitech knows how to work with bloggers, but does not know how to process the desires and requests of users.