'97 had the pre-predecessor with the same ergonomic principles, but then still PS2 (cable). I think I would have today, they did not possess such an appeal that they'll one day of my Arbitsplatz vanished without a trace. Now this. The trackball runs easy and smoth, wenns times rough running ball out from the bottom press, the free 3 Kugelpins of lint and you laüft again. I also think this here we again a durable product. Since it does not rely with a trackball on a flat surface with "navigation area", makes the wireless version extremely versatile, so you can also a few meters away from the chair or somewhere else to work with. Very convincing!
