Well, at least it was easy to assemble, but I don't really feel like I'm kneeling. I picked this one out because it was "adjustable". In the lowest position the seat is almost flat and almost no weight transfers to the knees. In the highest position the knee rest is at just as steep an angle as the seat, meaning you're semi-wedged in place, not really resting at all but having to actively and awkwardly lean to stay in position. I'm playing with the middle settings, but have not found one I'm really happy with. It does make for a more obtuse angle between spine and upper leg, but not much more than just tipping your seat in a standard ergonomic chair would do.