I have never experienced the "double click" issue except in very inexpensive microswitches. The whole idea with them is to give them some mechanical hysteresis so they don't bounce...
AFAIK Logitech uses only Omron microswitches for two main buttons except the cheapest models. And they are plagued with false double click issue even with the most expensive 50 million clicks rated variant.
I have a lot more problem with the plastics of the mouses. I dont think I ever had issue with the switches, although I always use wired mouse. So here is the history:
MX518: Plasitc logitech logo breaks into pieces. That is in the middle of the mouse, unusable.
G502: The rubberisation disintegrates, and collects dead skin, and looks disgusting continuously. Mouse wheel, wich is made out of some metal, paint wore off and it is rusting. And the wheel collects dead skin.
M500: Paint wears off. Why is it painted in the first place? Rubberisation is wearing off, after like 3 years of use. This one is for the office, so if I ask for a new one, they are just going to tell me it is perfectly working, and still better than the 10 year old crap that they are using.
But maybe I'm just asking for too much, a mouse should just disintegrate after 5 years of use.