That's not really anything new to the market. I've got an Ingersoll Rand air ratchet that I got about 13 years ago that's works the exact same way, and cost much less, too. Snap-On has one out, too. Don't know the cost, though.
Personal opinion, if you need more than 50-75 ft/lbs to break it loose, you might as well break out the conventional impact gun.
