I bought a set of the Badass tuners. They are definitely an upgrade to the standard MIM tuners. They feel more solid, they look better, there is less free play between gear teeth, and the action is smoother. All mounting holes lined up perfectly. However, the included bushings fit very loosely in the headstock holes. I ended up just reusing the original bushings. I don’t think anyone would ever notice. All that being said, I think the Hipshot HB7’s are even better. I found the fit and finish to be superior, and the 27:1 gear ratio is a nice upgrade. I can definitely tell a difference, and I believe I can be more precise when tuning with the HB7’s. To answer your question about weight, the Badass tuners are heavier than the MIM tuners by about .25oz each. With a four string bass, a set of Badass tuners would add about 1oz to the end of the neck. I would never notice a difference, but I know some people are very sensitive to that.