As for paid software, it is not required at all for normal use, and its purchase is only necessary if you have normally figured it out for trial 1000 shots. by the way, how I didn’t like my old x7 755FS, but in a year it began to creak and play and the wheel completely “went crazy” which I don’t observe at all in my (Bloody V5). Has pros: the whole mouse is a solid dignity. Design, ergonomics, price, additional features Different cons: I don’t know about the rest, but I don’t have any backlash or button failure for almost half a year of use