In terms of appearance and build quality (aluminum panel/front), it’s the perfect keyboard. Beyond that, the problems begin. I think I’ve had it for over 5 years. Logitech’s app, which lets you control the lighting, macro keys, etc., is ridiculously difficult to use because, after at least 5 years of owning it, there still hasn’t been any worthwhile improvement to make things simpler (if anyone manages to save the profile they created for lighting and shortcuts to the keyboard’s internal memory so they can uninstall the app, please finally let me know!). From time to time, some keys either don’t register at all or, more commonly, double-click in a way you can’t avoid. About 10 days ago, I removed all the keycaps to clean it (with a brush and a cloth, nothing extreme), and since then I started with 3 keys that wouldn’t register (fortunately, 8 on the numpad, right Shift, and one other I can’t remember). Two fixed themselves, but numpad 8 is still dead....
It has genuinely become tiresome.... very tiresome.
Seriously, get something else, or better yet, another brand that people own and are happy with....

After months of use, 3 buttons have already started to peel (w, s, alt) and I play MMO games, not FPS. Other than that, it's a good keyboard with good responsiveness, BUT for 200 euros when I bought it, it's unacceptable for the buttons to fade in just a few months. The G510s I have is still in great condition years later after heavy use, and the buttons are still fine.

Keycaps do feel a bit loose, and they are not your normal caps, and are too fragile, don't try to take them off or you're going to break them.

everything else is just perfect, I went with this over the 915 only for the reason that the rechargeable battery on the 915 is not AA or AAA interchangeable so I can't really fix it if the battery dies.

Very good keyboard. Mechanical and silent. The price is high but..... Every time I bought cheaper ones, I threw them away in a short period of time, like 8 months to 1 year. On the contrary, more expensive ones last for several years. I have another keyboard from a different brand of the same value for over 6 years of daily gaming. Usually, I change them to try others, and the older ones are passed on to children, wife, and friends. So, if you have the money because it is indeed quite expensive for our days, it's worth it. It also has Multimedia Keys that work with all my music and video programs, and extra buttons for macros