For what it's worth I have a Razer Blackwidow Ultimate keyboard and love it. The Razer Deathadder mouse is good enough without being spectacular. I don't do any serious, high speed mouse gaming - I just want an accurate, reliable mouse and it fits that function happily.
Needless to say, any kind of behaviour tracking or network requirements on future peripherals would be completely unacceptable and would rule out such products from being bought.
Playing: Path of Exile, Binding of Isaac, Age of Wonders 3.