Guys, op dayans are not worth it for 40+$ so many 2x2s are so close in performance. The guoguan, kung fu, yuxin white, and weipo are all almost as good (i think the guoguan is better) I owned a dayan and my friend has one. They will not make your times faster and aren't even worth it if you are world class. If you can buy one for 30 dollars that is absolute max you should go, other than that I would forget about it and but something else.