I have Fluidmaster/Kohler units in all 3 of our toilets, plus a spare unit or two. When I put in new toilets they came with Fluidmaster units, so I saved the units I had installed in the toilets.

I think they are great and will agree external factors may have more to do with it.

One problem I had, before I put a house filter in, was grit getting into the unit.
Grit got caught in the valve and allowed it to leak, you can snap off the top of the unit and check there.

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KLK, MCSE

1990 500SL

I was always taught to respect my elders.
I don't have to respect too many people anymore.