The rubbery thing works, but I don't have the grip. The Oxo opener grips well and gives me the leverage I need.
The warm water on the metal lid doesn't always work, I agree, and I ruined a knife trying to pop the seal, so I have used a special tool that uses the top of the lid for leverage, but that has bent the lid so I don't like that.
Yup. Sticking with the Oxo tool.