The machine heads are extremely solid and allow precise tuning and stability.
Esthetically flawless and elegant as any black hardware, the installation is easy, IF you have corresponding holes, otherwise you might have some difficulties, as I had, because the mounting rings are slightly smaller than the most common ones.
The machine heads are similar to the newest ones used on Fender basses, although they don't have the typical trapezoidal plate but a smaller one.