No one has claimed that the product "CAN'T" work .. just that they are not a company which stand behind their product in a professional manner, as well as the fact that the "operator errors" as you call them are due to the poor quality of the product and it's customer relations department.
If you have read this entire thread you would see that it simply can not compete with other products on the market, I understand that you have had good luck with their product however you are trying to compare your 600 gallon plywood tank against Wizzins 1000 gallon Concrete tank? Your trying to compare apples to oranges which in this case wizzin even mentioned that the tank doesn't leak a drop untill it's over half full... which would indicate that it's not holding the pressure of more water. It seems that your just trying to start a fire which has already died down IMO (If I'm wrong I'm Sorry)
Best of luck on your next tank and make sure you document EVERYTHING ... not just for the Sani-tred complaint department (should you not be AS successful) but for all of us here that LOVE to see Tanks getting built ...