Very disappointed with long-term usage. MX key keeps flashing or lagging or thyyyyyyyyyyyyyyyppppppppe like this... Mouse M720 triathlon keeps disconnecting, flashing, and lagging. expensive stuff is supposed to work seamlessly. I had to buy a simple cabled mouse. Having 2 MX key, and 4 mice M720 and M705. I've been working in IT for 25 years, and my Logitech home stuff is the worst that I have ever had.