The mouse portion of my cordless MX duo completely crapped out on me a week ago. I called up their customer service, and after describing the problem to the rep, she took my serial numbers off the keyboard, mouse, and reciever. She told me to go ahead and throw out the broken mouse, a new one would be on the way.
Yesterday my new MX duo showed up, less than a week after my call to customer service. Yep, they sent the whole duo in a retail box, not just the mouse. It feels so good using a new keybard and mouse after a week on my POS backup mouse. I can now retire my worn, crumb infested, soda stained keyboard as well, stick it in a closet for backup.
No doubt I will go out of my way to give Logitech my business over their competition, after some terrible customer service with other companies I truly appreciate a company that gets it right.