Summary: I've used Logitech's trackball mice for over a decade. I have 3 of their old ones called the Logitech T-RA18. These were superior mice and only GOD knows why Logitech discontinued them! I have now bought the M570 for a lot of money but I'm so disappointed I could cry. My only gripe with this product is the flimsy materials used in the production of this mouse. It feels cheap, flimsy and lightweight. It feels as cheap as a 'lucky packet toy'.
Summary: I love this mouse, except for the fact that the blue ball doesn't move where i want it to a lot. It gets dirty on the contacts inside. I clean it, but it still doesnt work properly. I really like this style of a mouse, but unfortunatly its time to go back to the old style mouse.
Summary: I have bought two of these recently as due to wrist strain I can't use a traditional mouse. They are almost, so nearly, great devices, they fit comfortably under the hand, they are responsive and can be used all day. With one big flaw that makes them infuriating to use: They use cheap and nasty electronic switches inside which wear out within weeks, resulting in double-clicks all over the place, and repeated clicking while you are trying to drag something, or draw...
Summary: Having used many Logitech products such as Keyboards and mice when my mouse died i started looking for another. I looked a other brands but stayed with Logitech thought it was a safe bet. Ordered on line the M570 trackball to reduce wear on my arm. Well it arrived and i started to use it ball felt loose and hard to control maybe just me getting used to a new mouse.
Summary: Musen fungerer rigtig godt med trackball'en og den ligger godt i hånden. Men den har det mest frygtelige scroll hjul. Det er ikke muligt at slå smooth scroll til - dvs. den kører altid i de der små hak - og det er værre end jeg har prøvet på andre mus. Det virker som noget billigt l... Jeg bruger hjulet rigtig meget, så det trækker meget ned, at det ikke virker særlig godt.