Sorry to say but imnot so happy with this option+ for next reason... I added keyboard shortcuts to the buttons at the left side from this nice mouse and on logi option (normal without +) it worked fine. I installed option+ and the buttons DON'T work anymore so i have and had to remove option+ again to get it back to work againand yes it works on normal option. I installed option+ again to see if it was fixed or something and still the buttons (programmed) don't work again so im gonna remove option+ again because its NO FUN at all.. i think its a bug or something but i wonder why it isn't test alllll over before release?