Since I have been using the US keyboard for many years, I noticed I have a difficulty typing on the Japanese keyboard (my company's PC has the Japanese keyboard). There are some extra keys on the Japanese keyboard even though the basic layout still has QWERTY in the right place. When I try to reach "return", "shift", and "delete" button with my right hand (I type without looking at the keyboard) on the Japanese keyboard, I miss those keys quite often, not to mention some other keys for ?, -, +, and others.
Have you experienced similar difficulty adjusting to the Japanese keyboard? I know I will only buy Mac with the US keyboard (Apple offers that option). Is it worth learning how to type on the Japanese keyboard? Or, should I just stick with US keyboard and buy those keyboards if needed? I already have several extra US keyboards I brought home from US.