All canisters fail. They fail primarily because of the user.
I have used Garcia, Bear Vault, Bearikade and Ursack products. I have never had a failure with any of them. The only time I have lost food is because I failed to protect it.
I use these products the way the manufacturer says they should be used.
If you have any questions about Ursack products, just email Tom Cohen he has always responded to any inquiry I have made.