Pros below: All and sundry have already said about the merits. As far as I understand, the encoder is repaired with improvised means, and the support sends a new mouse, so you buy 2 for the price of one =) Its cons: A very large percentage of wheel defects, according to subjective sensations, 2/3 or 3/4. Support saves, but who does not want to have problems with this, it is better not to take it.