Too expensive my son

Accustomed to the Logitech brand for years and have owned several wired mouse, I decided to take this trackball to supplement solar keyboard K750.
With Unifying, the trackball is well recognized on the same dongle as that of the keyboard: USB gained.

The trackball is doing its work even if it is really small, too small.

For cons, I am very disappointed by the quality of the product indicates Logitech prices. I have the impression that this is a Chinese product counterfeiting than anything else.
Actually fragile, I'm afraid she has broken the first fall.

This is therefore a trackball yes, but that does not deserve the logo nor the Logitech rate.

Update: After 2 months, the trackball abruptly stops working. I therefore confirms that it is indecent to pay a Chinese product to the European price