Advantages and disadvantages compared to old Logitech trackball

The case has changed slightly over the old trackball, has become a little rounder. This small rubber triangle in the area of ​​the little finger on the side is gone, but there are two additional buttons.

+ Good connectivity. Can now also be easily and simply on the USB dongle the keyboard Teach (Win7 / XP). This saves a USB slot.
+ Good coverage. While the old at max. Made 2 meters limp, these works throughout the room (handy if you sit on the sofa and the PC is connected to the TV)
+ On / Off switch and battery status LED
+ No rubberized surfaces more (except scroll wheel) => the failure reason for my old trackball, as the gum has dissolved and became sticky (as with my old keyboard with comfortable hand rest)

o Good, good haptics

- The new ball runs extremely choppy and difficult. Have changed from the old trackball the blue ball with the red. Red ball is going well, the blue in the old trackball but also much better than in New ... I had then but increase the Mauszeigergeschwindgkeit ?! (Assumption: scanning of larger black dots on the red ball).