Professional Deck Builder using Post Protectors for many years...
Not sure what complaints are about, but I assume it could be people not understanding what a barrier material needs to be. The product as is, is perfect. Lightweight, easy to install, keeps the soil from coming in contact with wood post, as well as keeping the sun's damaging U.V. rays from aiding in the rotting where the post, soil, oxygen, and sun's rays would all come together at the first few inches of grade where the post enters the ground.
Before switching to Post protectors, we were using
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a thin rubber membrane that would be put on like a sticker/decal, just around the posts flats sides. It did not provide uplift protection though, or a nice appearance with a moisture drainage path. And trying to apply it in the cold was impossible.
The product allows for better lateral bracing and support, since you are now putting the post down into grade, lowering its center of gravity, and using the back-fill as additional support, and provide the post with better uplift protection than a single lag bolt into the concrete, as is done without using the Post Protector.
As far as needing to be a thicker gauge plastic, not so. We dug a few up last year, to add an addition to a deck we did 3 years ago. Even our digging bars did not do damage to them, and we were able to re-position, and leave alone.
I have been using the product for years, since the company opened, and now get them through HD, since I am ordering my Simpson steel hardware through here as well. Makes it all more convenient. I recommend the product highly. And will use as standard building for as far as I can see.