I believe that, while I worked at the Dispatch, I got more comments on this keyboard than I did on the actual quality of my work.
It had been used before me by a co-worker with wrist problems until she switched to a position that required less typing and more keyboard shortcuts. The keyboard sat unused until I asked if I could maybe use it, and everyone said yes, please, because it scared them. And no one ever borrowed my computer again.
It took me about a day's practice to type fluently on it, and soon I was back up to 90 words a minute or so.
The side mirrors are mostly meant to help you with the numbers and the function keys, since all but the most adept touch-typers like to peek when they punch those. The text on the F and # keys is even inverted so it shows up right in the mirrors.
I got to take the pricey keyboard with me when I left the Dispatch, and no one was sad to see it go (except occasional kids who came through the newsroom on job-shadowing days, for whom it was definitely a highlight). The mirrors got broken off in the move, but it still works great.
Now I use Joe's computer and keyboard more often than I use my own. I miss the lovely vertical, which is sitting quietly next to me.