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I use yamada's.
But I have not tried other ones except a few oddballs.
We found the Yamada Pump out of sheer desperation. everything else (non air diapraghm) was failing.
My Company. Apple Roof Cleaning, does at least 2 roofs a day 5 to 6 days a week.
We are hard on Pumps!
I found the Yamada's, they worked, so I stuck with them,
I have NOT tried any other air diapraghm pumps to speak of.
The Yamada is unique in that it has a "re set" button in case the pump stalls.

I would just like to have a discussion with anyone elses experience with the Air Dipraghm Roof Cleaning Pumps ?