As for the magnetic grills, on all my Axiom speakers that I own the grill mounting is very solid. There is no way that the grills would fall off EVER. Not sure why they would want to change what is perfect already regarding the grills.
Axiom is adding this feature because it has been requested many times by people who prefer to have their grilles off. Hidden magnets result in a cleaner look than the exposed black rubber grommets. Ian discussed this with the customer council during one of our conference calls and he assures us they're using strong magnets that really hold the grill in place.
