Nev, I bought a heap of cheap ones from ebay. No problems so far.
The good stuff may be from the same factory? Anything NOS and rubber is for exhibition only.
The go with stuff from India is to log in to ebay in different countries (ie US, UK etc) and check the difference in postage to Aus. Still coming from India. I'm not sure why it's different, but it often is.
'51,'56 Squares, '48 VH, '27 Model C, R67/2, Mk IV Le Mans, '06 Super Duke and Ariel projects.