Disco Sit - 15"

I'm still undecided. It does make my upper back ache after an hour or two of use. I think that is expected due to forcing proper posture. My biggest reservation is even when partially inflated, it is pretty hard when sitting on it. Guess I'm too use to a soft cushion. As an office worker, I need all the help I can get. If this works, it may be worth the "getting use to it time". So far, I'm not use to it.

Helps my lower back as I sit in a chair all day at the office.

Bought it over 2 years ago and still using it, it is a great product.

has improved my posture and lower back ache