The part in and of itself may be fine, it's just that when it fail (not If, but when) you have to drop the trans to replace it.
As an original owner, mine went through five separate internal slave cyls. Some lasted for many years; some only lasted 2-3 years. The part is not expensive. Its the labor to drop the trans and reinstall that made it costly.
As I have stated repeatedly on CC, mine saw 5, it was never going to see a 6th.