The tuners themselves are great. But disappointed in Grover for including such crap securing screws with this product. Put the first tuner in, no problem. While putting the second tuner in, I was beginning to put in the tiny securing screw on the back of the headstock and it snapped, leaving a portion stuck in the headstock that I then had to deal with trying to remove it.
I build guitars and have used all of the upscale tuning keys on the market. I find Grover to be the best value for the money and excellent tuning machines. I now use them exclusively.