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As if it wasn't bad enough that they want me to use a random internet service to add a keyboard to a usb wifi receiver, they have the balls to put this for Firefox users. I clicked out of pure curiosity, as I'm not even remotely interested in involving a corporate internet service in getting my keyboard connected to my computer. This is the message you get now on Logi Options software if you have a Unifying Receiver: 
For the curious: https://logiwebconnect.com
EDIT: some people on the thread have brought up that the error message being displayed for Firefox users is due to the WebUSB API not being implemented by Firefox due to security concerns. This still does not justify having to use a web app to plug peripherals to a PC.
I've owned Logitech mice for years and they've all been solid. I have a Steel series keyboard and I'd like to move away from Logitech, but SteelSeries doesn't make a mouse with enough buttons. I use the G604 right now and it has the right amount of buttons for all the random productivity stuff, like assigning copy, cut, paste, paste as text, etc to buttons. SteelSeries mice either have a few buttons less than I'd like, or a moba mouse with like 30 buttons lol.
I haven't checked Razer but I haven't been thrilled with their previous designs and I just want to consolidate to just one piece of software. I've had a couple of one particular Logitech keyboard and a few of the LED would burn out and only display certain colors. And that was after a year or so.
Have a look at Roccat mice, the Kone XP (wired) or the Kone XP Air (wireless) mice might be what you are looking for.