The Austin Kneeling Chair.

I have used it for a week. I purchased it as I have arthritis in the hips and I sitting in a other types of chairs for a long work day has had negative affects. While it has proven difficult so far to use in the kneeling position, sitting with my legs angled straight downward between the knee rests has been much better than any other type of chair I've tried. I believe it's because my hips are tilted downward as apposed to horizontal.

The chair is great but it does hurt my knees when sitting on it for more than a few hours

Love this chair. It feels great on my body and is good for ADD fidgeting. I even gifted it to a family member who tried mine and loved it. They said it relieved back tension after one work-day of using it.