gewöhnunsgbedürftig but then totally ok to very good ....

Although the thing looks "strange" to "crazy" on the desk - yet: nice loosening the blue glowing UFO strip ... :-) - but after a familiarization period of several days is now the relief of the wrist to remember and also the problem "slipping to the left" dissolved due to fortified clicks. You just have to just now against the thumbs (hold!) Instead of pressing down on the table. The already mentioned also in customer reviews, initial slippage is due to the very good smoothness on the table or on the mouse pad = actually a positive feature of a mouse! , In sum already noted Missing "hand-twisting effect" normal Mäsue right after a few days clear away the occasional pain in the wrist. Anyone with such pain has problems should try this mouse sometimes, I can really recommend. And: Is just a typical USB mouse, ie niceties like pixels gear or double-time and everything else possible one imagines precisely in PC system. I use them the way, mostly in Debian and even other Linux systems, rarely in Windows7.
Recommended.