I have a 272xp that I bought a Chinese clutch cover and brake assembly for. Don't know how a 272 compares to a 266, but my unit works fine. When I bought it, the brake was so stiff that I thought it didn't work. Contacted the seller, who immediately sent another. Then I found that the unit was okay, I just hadn't pushed hard enough to activate it. Got a shiny new unit in reserve if this one fails. I don't use the 272 that much (it's a backup for my 372, which is backed up already by a 371) so it's not likely to see use.
My strategy for Chi-made parts is: Never, never on critical engine parts, but worth a try on certain stuff like a clutch cover.