Upload & Sell: On
Oops -- sorry about the 85mm thread size, but the same applies.
DH -- I must have 20 different aftermarket hoods, half screw-in metal, and half plastic replica, and I haven't had one failure. I'm not saying it's not possible, but the odds are in someone's favor.
Another advantage of the screw-in metal: I'm going back to re-check my Samyang 85/1.4, and already had a replacement hood (the original is too big for me) from heavystar with the cap. Looking at it today, and rummaging through my hoods and step up rings, I found a nice 77mm wide that I could use a 72mm to 77mm step up to bring down the overall length, while still giving decent hooding for side lighting. Step-up rings make for lots of interesting combinations.