The link you posted from 2014 is most likely speaking of the old style 2 piece unit that had a separate pressure diaphragm that was per my understanding very finicky. The current units are one piece and have been reported to me to perform well as long as you abide by the installation instructions particularly the fact that they don't like ram air.
There's a respectable number of them out there flying so just realize that a few negative reviews from someone on the internet who may or most likely did not adhere to the installation guidelines makes it sound like a lot worse than it is.
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Maule MXT-7(daily flyer)
Lancer 235(partner)
Raidial RV-8R Ephanage Done, Wings Done, Fuselage on it's tall Grove gear & engine hung
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