Not worth the money. Not comfortable and doesn't help the back.

It was great at first, but deformed after a couple weeks. It's also a bit too small for a decent-sized chair.

I purchased this product, expecting that 8,000 positive reviews can't be wrong. But alas, this product has not solved my problem, nor has it made it easier on my coxis. Actually, my coxis felt better by just sitting down less and standing up more. This product did not elevate me properly in order to put less weight on my coxis. It just plain didn't work. It's comfortable as a seat cushion but as far as aiding you if you are a coxitis sufferer, I can't give this product my seal of approval. I think 8,000 people just don't know better.

to big/bulky to carry around where i need it easily.

Not comfortable to sit.....that was the idea behind getting it.....comfort.

I used this for my back. I work sitting and my tail bone has been hurting a lot for a while already. I used this cushion but feel no difference.

its very firm adds too much loft to my car seat making my head hit the roof so am unable to use it...

Not as comfortable as expected.

Just meh...the cover shifts and the middle bump isn't prominent enough to give SI relief. Frankly a waste of $40.

Too hard for the car and doesn't fit the contour of our car seat. I wrote the seller to return them but received no response.