My handmade guitar has suffered the indignity of having cheap tuning machines fitted. This was largely due to a budget issue and I had resolved to upgrade them. After a lot of research I decided that, rather that spend a good deal more, I would give these a try. They are perfect. Their action is smooth and, after having fitted them a month ago, they do not slip. Also they look like more expensive ones.
The only negative comment is that one of the fitting screws had a defective head ,but that was easily rectified.
In summary, they perform well, look great and are good value