I have had the Lock since it was released. This ball is currently my best rolling, hitting ball I have (see profile). This ball saves it's energy for the pin deck. I do not have allot of revs, so with this core it helps me get a few more. Now the ball oob did not work for me, but I have only used it for THS. I changed the cover to 2k and added polish, then this ball just came alive. Now if you bowl on heavier conditions the cover change probably would not have been needed. Since I have a Hyper Cell, the Lock compliments that perfectly. I do not have a Critical, so my observation between the Lock/Critical is ( depending on layout/cover) is the Lock will have a smoother, strong roll, and the Critical is more angular at the pin deck, so it depends what reaction you want. Both balls are a great choice. Its too bad you can't go to a matchmaker and roll both first. I may get a Critical in the future, but since my Lock has been so good, I don't need another ball, yet. I hope this helps?