Though I'm not sure why you'd use one over a regular keyboard tray and a monitor arm for, like, 1/5th the price. (My tray + monitor arm was only $250 together.)
I find standard office desk height too high, I'm only 5' 3" so I have to raise the chair until my feet don't touch the ground, which puts more strain on the back. Also, I haven't found a keyboard tray that can accommodate a keyboard, two trackballs and a tablet. I need these to be on the same level.
I've been thinking of getting a set of VIKA KAJ legs from IKEA until I can replace the whole desk but I'm worried they will wobble too much.
I was really surprised when I went shopping for an office chair. I had a nice big leather chair in mind but the seat was too deep on every one, I couldn't sit in it with my back supported. I ended up getting a plain one that fits me perfectly.
I think those Herman Miller chairs are ugly.