+1 Gryph I wouldn't bother with the OEM, the retrofit is easy and cheap, I even bought a spare for stock. I did research failures on the Chinese ones and the only fault I could find was leaking sight glasses on their front master cylinders. I did pull one apart and the quality was fine, I think with the number they have sold if there were any major problems they would be posted by now. I can buy 7.5 complete Chinese master cylinders for the price of one OEM master cylinder kit.
Regards Martin