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Logitech has ‘no plans’ for a subscription mouse
(www.theverge.com)
This is a most excellent place for technology news and articles.
I'm still replacing switches on my stupid Logitech MX (faulty design that's been going for many years) but once it's dead for good I will switch over to the Ploopy thumb trackball in a heartbeat.
I really like the look of the Ploopy Classic. I use an Elecom Huge, and I love it. I grew up with a Logitech TrackMan Marble (the old school one, not the ambidextrous one) and I loved it. So the Elecom Huge is like a modern version of that old classic, and it's great for office and daily use - not so much for gaming though.