After a few month typing on fairly new
Cherry keyboard I felt somehow uncomfortable with it so I started searching for a new keyboard.
I thought about buying one of these
natural ergonomic keyboards but they have two drawbacks, they have many additional function keys which are not supported by non-Window$ (zoom for example) and which I don't want and they are made by Microsoft.
My new keyboard is a Dell Spacesaver and I feel really comfortable with it,particularly because it has absolutely no special function keys (ok apart from the MS-key) and the flattened keys at the bottom of the keyboard feel really good when typing.