I agree. 572Bs aren't what they once were back when Cetron was making them.
3-500ZGs, on the other hand, seem to be pretty good coming from China. I don't know if they're as good as the originals from Eimac, but they're pretty robust. It's the reason that I recommend the AL-80B over the AL-572 to almost anyone.
I have a "Chinese" 3-500ZG (RFP branded) for six years now in my AL-80B and it works exactly the same today as it did six years ago when I plugged it in, and gets used daily at full power.
I can only hope they keep cranking them out like that. Nobody knows.
What if soy milk is just regular milk introducing itself in Spanish?