Rubber winchers (tailers) any good?

[Stemar]

Update.
I bought two of these and fitted them last winter and so now have a season with them.
Not as good as proper self tailers (as others said), and I have experience of those on another oat I sail frequently, but a huge improvement on hand tailing from my existing non-ST winches. So, I say a good purchase.

Exactly my experience. Mine are getting tired (at least 15 years old) and when they turn up their toes, I'll be replacing them