In practice most people don't care about the charging port being on the bottom because even if you forget to charge it for several weeks and it actually stops w

In practice most people don't care about the charging port being on the bottom because even if you forget to charge it for several weeks and it actually stops working it only takes two minutes to charge it up enough for 8 hours of work. As far as ergonomics goes, I've never had any more problems with a Magic Mouse than with any other mouse including ergonomic mice. People make fun of "you're holding it wrong", but really RSI does come down to holding and manipulating things in ways that aren't good for you. What ergonomic design does is try to make it so you that you will discover and use a good way of holding the thing on your own and/or try to make it so that it is hard to hold it in a bad way. That doesn't mean that things that do not have an ergonomic design cannot be used ergonomically. It just means you might have to consciously work at holding and manipulating them safely at least until that becomes habitual. For the Magic Mouse the way I hold it has my fingers and palm and wrist in the same position they would be in if I were just resting my arm on the table. The mouse is the right size and shape to fit well in the dome make by the curve of my resting fingers and resting palm. I don't really have a grip on it. It is more caged than held. Movement is mostly moving my whole arm. My wrist has barely any movement at all. Even when scrolling the wrist barely moves. Instead my arm backs up and raises so my middle finger can bend down and scroll.