I think Logitech is the Google of input devices. And not in a good way. They tend to design awesome, clever, stylish devices (used to be of good quality too, not so sure recently) only to kill them silently after a short time. And when I want to recommend one to others, buy a second one or replace mine a couple years later, I find they no longer exist. I've largely stopped buying higher-end Logitech devices because of that, even though I love(d) so many of their products.

Among cool Logitech products which have been killed even though they had no equally cool or better alternative:

1) Logitech diNovo Edge (a beautiful keyboard with an upright stand, ideal if you need desk space)

2) Logitech Presenter with green laser, timer and display

3) Logitech diNovo mini (the best ever tiny media center keyboard IMO which ran circles around the $20 cheap China ones you can get exclusively now; it looked so futuristic, it was even used (unmodified) as a prop in a sci-fi TV show as some kind of futuristic communicator

4) Logitech Cordless Optical Trackman (where the ball is in the middle and not operated by the thumb). This device is so great and coveted that it now goes for high three figures on eBay (originally less than $50).

And a couple more which I can't think of off the top of my head right now.

They came up with a few interesting products in the last years which I would have totally loved to buy but just didn't because I knew they were going to be killed again within a year or two.

What weird world is this where keyboards, mice and laser pointers become expensive "fashion accessories" and you can't rely on equal or better replacements being available at least for a 5-10 year lifespan?

It must be so frustrating to be a product designer at Logitech, designing all these beautiful, close-to-perfect devices only for some bean counter to pull them off the shelves if they can't create hundreds of millions in revenue from them... :-(