I just retired my Logitech mx518 at work that Ive been using for almost 20 years. It still works but lacks features. I switched to the MX Master and now own a second it's so good. I operate multiple devices so the quick switch function is a game changer, not to mention the magnetic infinite scroll and horizontal scroll.
At home my gaming mouse is a 502 but I miss the features of the MX Master now.
I have mild sleep apnea and a night device that improves my airways has eliminated my sinus congestion in the mornings. Talk to a dentist that specializes in sleep apnea.