mouse incredibly vague - disappointed!

for its price, I am extremely disappointed. whether wired or wireless is incredibly imprecise. yet I installed the latest driver in win7 64bit.
the movements are not those of the hand, it is sometimes slow or even unresponsive or incorrectly.
I, who had bought it for playing games requiring precision, it is quite useless in the heat of the action.
I have been patient, I persevered but there I can not stand it. I ask back.
I do not advise you.
by cons, it is configurable, it is convenient. 12 buttons may be too. after 15 days I managed to get ownership of 7 of 12, it's not bad. if it were accurate, I give her a good score.