I currently own the Logitech Classic Keyboard 200 USB Keyboard:

It is pretty comfortable, keys are soft, pretty standard layout. Only problem is that sometimes it feels like my fingers get a little cramped (only when I think about it).
Is getting an ergonomic keyboard a wise thing to do to maintain good hand-health for the future (10-20 years)? Or is it just a marketing scheme to make more expensive keyboards with no real health benefit?
The keyboard I had in mind is the Logitech Split Keyboard:

I played around with the Microsoft Natural but the space button seems flawed and I generally dislike the quality on Microsoft products.
