There's a new keyboard in town and it's replacing the original MC184LL/A Bluetooth Keyboard. According to Apple the differences are subtle being slightly tweaked to accommodate OS Lion on Mac. According to Apple, the only changes should have been the F3 and F4 keys (icons) for Mission control and some other feature I can't remember at the moment. However when it comes to ipad compatibility, the differences don't stop there. F3 and F4 on both the original /A and the newer /B model are not supported on ios, therefore there should be no difference between the two, but for some reason nobody really understands at this point, in the /B version (Apple is phasing out the /A) none of the F keys work such as Volume, Brightness and ipod controls. I've been in touch with Apple and they are unaware of this problem and have no answers as to why these features are not working in the /B version of the Bluetooth keyboard. So, for the time being Beware of the /B version if you're purchasing it for use with ios. While the standard keys work and typing is possible, those extra keys are not working on the /B version. If you can find the /A, grab one because it's unknown when, or even if those keys will be fixed in the /B iteration of the keyboard.