1. You can tuck a key under the doormat if you lose the ones in your pocket. Not so electronic gadget. 2. As somebody else mentioned - flat battery? lose access to all your property. Flat battery in the lock or power cut in the house? lose access. 3. Replacing locks just got a whole lot more expensive and no doubt all lock makers would have to have some kind of license agreement with Apple. In short, LAME. This seems to be technology for technology's sake. I can see pretty much nothing but downsides to this.