I'm a longtime Logitech peripheral user and it's fairly disappointing that they always have some shortcomings that keeps me from loving their products. For instance, I write this article on a K760. It's similar to the Apple wireless keyboard but it's solar-powered and has multi-device capabilities. Unfortunately, its build quality is mediocre. I'd rather pay 20-30 bucks more and have a keyboard that feels better. Also, they removed the previous/next track buttons from the top row for no specific reason.
With this keyboard, the build quality seems even cheaper. They missed the chance to go solar (though that's debatable) and the fn key is in a different position than my current Logitech keyboards (they don't seem to have a guideline for this).
Very much agree on build quality. I mostly use their mouses and their rubber side always wears out after a couple of months and if I'm lucky with that, I get the common double clicking problem with left click. Thankfully their customer support is amazing and they send replacements without too much hassle. (They even sent me a new mouse once even though it was out of warranty.)
I've had quality issues with some of their previous keyboard mouse combos, particularly bluetooth mice and perishing rubber.
However currently I use a M325 wireless mouse and its very tough. Carry it in my dusty laptop bag, dropped it a few times - no problems at all. No issues with rubber degradation. Highly recommended and works with unifying receivers.
Also, once I broke my mouse, gave them a call and said "We are sorry that mouse is not in production anymore... So I will send you the newest version for free (80 euro price tag)."
I've just been unlucky, I guess. The longest Logitech mouse that lasted me was Logitech MX500 (around 3 years), which is funny because I also had top of the line Logitech mouses (MX Revolution, Mouse MX etc.). They were usually the least durable ones.
I believe that's fixable, but I don't know how hard the fix is. I wouldn't advise you to try to fix it on your own unless you know what you're doing, or you've already contacted their customer support. Don't hesitate to contact their customer support even if your mouse is no longer under warranty.
With this keyboard, the build quality seems even cheaper. They missed the chance to go solar (though that's debatable) and the fn key is in a different position than my current Logitech keyboards (they don't seem to have a guideline for this).