I bought these for a partscaster build.
Pros:
- hold tuning almost perfectly
- look good
- the top-loading system (you put the string in from the top of the
tuner post) makes it very easy to change strings. No need to wrap
the string around the post, you can just turn the tuner and the string will wrap itself around the post 3-6 turns, which is just enough.
- The price. No need to go for 50-100¤ tuners.
Cons:
- You might need to drill new holes into your guitar headstock if you get these (but it'll be worth it)