This brings up something that has aggravated me for years: Fluidmaster (and every other manufacturer of "toilet guts") makes plastic garbage.
We keep toilet guts in stock. There is rarely a week that I'm not replacing the guts of one of our 25 toilets, due to running on, leakage or noise.
I long for the days of the real brass, simple donkey-float style toilet guts. They lasted forever and were easily adjustable. My local hardware store doesn't even sell them anymore, because the plastic junk is half the price.
Sure, the new stuff is cheaper, but if you're replacing it twice as often...