I just bought two of these today – and so far no major complaints. I’ve been using a Natural Pro for years at home and (get this) I have 4 or 5 of the really old MS Natural Keyboards at work and home in rotation since around maybe 94? About once a year I rip the keys off an wash them 
I actually miss the sleep button – I got use to shutting down every night by whacking that and hitting enter. I was also surprised to not see USB ports.
My only minor complaint is that I keep not quite depressing the left control key. I use the outside of my palm (below the pinky) to depress it – but it’s further away now in a little valley.
Now I want to figure out how to remap the zoom key to something useful - like vertical scrolling.