This doesn't exactly seem like a new idea. Some people may remember THESE "ergonomic" chairs from decades ago: http://www.interiorwarrior.com/wp-content/uploads/2011/03/Ergonomic-chair.-models-and-prices2.jpg

Yeesh, this looks *uncomfortable*!
I think I'll stick with my good old standard office chair that I can slouch in...... :)

This is actually quite good. Sitting long time really IS a problem. Watch the video: the inventor addresses a real problem of his...and likely of many other people also. (I was developing my own hight adjustable computer stand: sitting/standing/laying at the computer monitor at a whim. Gizmag was writing about "emperor" workstation for a different effort taking on issue of monitors) (http://www.gizmag.com/emperor-1510-workstation-mwe/21412/ Ed.). This chair seems to fit the project perfectly. ...or perhaps some more advanced body-copying robotic servo motor design one day.There are robotic furniture projects going.
I know of the older version of the sitting/kneeling chair. I have it ...and do not use it that often. The innovation in this project is it is much higher. The piston's on the fly hight adjust-ability and free movement around is another difference: with the old seat you were just fixed into a position. With this one you can "fly around". This can make for the critical difference.
Yes, you will go back to your classical chair. The sitting is not bad as such - it is prolonged uninterrupted inactivity that is killing in it. Changing between chairs and interrupting "sitting pattern" should help. The risks of sitting are real.

Why does that guy from accounting always standing around looking like he has a stick in his @$$?

The price will kill it, as surely as it killed other similar designs in the past. This idea will not take off until it is priced as much as an ordinary no-frills office chair. These ergonomic inventors all repeat the same error, let's call it "naive greed": they seem to think that the way to get rich is to gouge the market the highest price (they think) that it will stand. The reality is that to actually corner the market, you sell a cheap product at large volume. While there are some types of product that do behave differently, gadgets like these can safely be assumed to have a highly elastic demand, i.e. will behave as above. Think of any gadget you remember that swept the market by storm; the common factor was the low price, wasn't it?

I think the main purpose of this chair is to lighten your wallet. It is incredibly expensive compared with a normal office chair. The real answer is to get up and have a walk round every half hour or so. I'm sure that would be permitted. Just have a timer on your desk to remind you. This is a much cheaper solution, and gets the blood circulating better. Who wants to work all day sitting on a bicycle saddle? (Unless of course you're a cycle courier)

Must for warehouses (non automated), offices, auto repair, aviation repair, retail, etc venues. Nice design, Id have stand retract onto tube for carrying chair.

In Europa you find thuch many years a simulary system called "Sattelstuhl". Very efective, very saludable and much le$$!

I think this completely misses the point of the studies regarding sitting for prolonged periods. It also looks about as comfortable as an airline cattle class seat.
The issue isn't sitting, as the article states standing for prolonged periods also causes it's own issues. The problem is that the human body is meant to move, at least some of the time. That means that any activity that involves remaining motionless for extended periods of time will have long term repercussions. Rather than wasting money to buy these chimera chair/bicycle seat/stool things a company would be better off designing a work day that required desk bound personnel to move around at least ten minutes of every hour, rather than the two fifteen minute breaks and an hour lunch model that is so polular. It would improve end of day productivity as well because keeping the blood from stagnating in the extremeties also boosts brain function.

Oh yeah, an ergonomic chair. Try a garage sale. I have one in the cellar I got years ago.