Ergonomic Kneeling Computer Office Chair

I need to save my back and hip flexers.
 - Research Physical Therapy / Masotherapy techniques
 - Watch my posture every time I sit down
 - Buy this chair: http://www.sit4less.com/categories/kneeling-chairs/19?gclid=CO3Vx_Piy5wCFeNB5god31YZKQ