Do you feel it warrants the full price tag? I've been looking into them however just unsure if I really want to spend almost $1k on a chair.
Was it worth the cost? Yeah, yeah it was.
Ignoring the ergonomic benefits, it's just a damn good chair. It's very comfortable. The tilt options are particularly good. I've been known to drag it into the living room to watch TV on if I'm having a bad posture day.
And the lifetime guarantee is really nice, and appears to Really Mean Lifetime. The seat started going about three months ago - I phoned HM up, and a new seat turned up in a truck about a week later.
I can imagine not buying another chair for 10-15 years or more, and at that sort of timescale, it's a bargain.
(See also: the Captain Vimes "Boots" theory.)
At my office we have the Human Scale Freedom's which are also comfortable, but not as adjustable. We've had 2 break (1 arm rest, one handle on the back) recently, but other than that they are great chairs.