The dual chamber air is great for my sitting position and scoliosis. I really love it.
Being a Paraplegic, I do many transfers. The non-air part (front part, under thigh) is too hard and hurts my tush a lot. I've never had a pressure sore since my disability, and using this cushion for 2 weeks, it started to give me bruise pains. I don't recommend this cushion to Paraplegics who do a lot of transfers (chair to bed, to toilet, to sofa to car multiples times a day) , but I do recommend this cushion to all others because it's great helping with seating & posture.
Paraplegic for 13 years. Have used Varilite Evolution cushion most of those years. Bought Pro-Form to help with my scoliosis/sitting position.