The -:
1. noise clicks unpleasant (inflexible): A star less
2. roulette is not very flexible too: a star less
3. difficult dongle back into the USB port on my laptop, but easy with another computer
4. The dongle can solid part of which remained in the USB port of my laptop ...
With the exception of mouse clicks noise, overall utilization is positive, and the connection to the computer is immediately right from the dongle inserted.
For the dongle, whose tip is left in the USB port, I can not make a generalization and penalize the products on this point, to confirm whether or not with other assessments.
I do not feel that the mouse uses Bluetooth (I have not gained for this), so unable to function without the dongle. Anyway, if this is the case, my computer was not able to discover.