I recently purchased a 12v x2. It impressed me with its good ergonomics, and a feeling of quality. However, the quality issue was questioned upon closer examination. I notice that not only was the chuck body not cylindrical, but also,one of the chuck teeth extends beyond the other two. This results in a wobble. The problem with the chuck body seems non-functional, while the problem with the chuck teeth causes a wobble in the bit being used. I've always felt that Jacobs chucks were good, but now I wonder if I made the wrong choice of drills.