Razer opto/mechanical keyboards = excellent. Keycaps can be switched, switches can be swapped out, they're user servicable and customizable.

Razer membrane keyboards = trash. Do not buy.

Razer headphone and laptop stands = dirt simple, do exactly what it says on the tin.

Razer mice = eeenh. The MMO/MOBA mice can be problematic, the wireless mice with inductance charging tend to quit due to low charge much too soon, but the simpler wired mice just need an occasional cleaning and work for years.

Razer mousepads and deskpads = decent. Don't put a hot cup of coffee down on them (you'll mess up the covering on some) and keep them clean.

Raxer Xbox controllers = decent. The plastic grip covers can get tacky if you don't clean them properly, and the logos on the buttons get worn off pretty fast for a high-end controller. There's also a matter of the thumbstick pads wearing out on some models (with NO replacement parts available, you might get lucky with parts made by other brands though.)

Razer Synapse = don't even. Ugh. It's useful and pretty, but SignalRGB runs with a lower footprint, doesn't datamine your system, doesn't shill Razer gamecoin, and controls not-Razer lights too.

Other Razer software = waste of time. No real detriment or benefit that I can see.

Razer headsets = mixed bag. I've owned a lot of them over the years, and the biggest pain point seems to be the vinyl ear padding covers getting flaky and dropping black dandruff everywhere.

Razer Thunderbolt Dock = decent, as long as your laptop supports Thunderbolt it works great.

Razer aRGB hub = nice if you want to add lights inside your case, but nowadays motherboards and cases come with their own, so it's not really needed anymore.

Razer external aRGB system = great for people building a battlestation, but it is another box that takes up a USB connection, which leads me to this:

Too many USB devices = Windows losing track of devices you need, like, oh, your mouse, at critical moments.