50mi on it now and there are no blemishes as well as it being quiet.. so I'd guess it's machined correctly.
Durability... We'll have to wait and see about that.
Why not do similarly and give one a try until you figure out exactly what it is you want to do and in turn give yourself more time to track down the golden chainring.
Can't find the order right now, must not be in the system yet. Dang, I forgot to check that this chainring is for 9 speed. Oh well, if it isn't, no great loss