A booster seat is useful if you are small (me) or if you have children at the spa. This may allow you to position yourself better so the jets on your back or shoulders work the way a bath should work. If you have kids, this will help keep them afloat in the lower seats. Our hot tub doesn't have a chilled seat. I can stack two of these boosters on top of each other and use them as a cool seat. I filled the "pocket" with golf balls instead of rocks or marbles. It worked fine once fully surfaced. I left my booster in the water so I don't know how long it will last. I bought a water brick and also Belize as I wanted two locations. As for cost, they only differed by a dollar. I'll update this post if/when a replacement for one or the other is needed. Update - UPDATE - JULY 2016. Walked into the hot tub and pushed the seat aside. I sat down and found myself sitting on golf balls. Yes. Pushed the seat towards me and Belize fell apart at the seams. I'll contact the company right away. Waterbrick is fine - no issues or seam wear. So in this very informal experiment, I have to walk around Belize with the water brick. I know you can tell the chlorine was gnawing at the seams. But I would say they know this product is for hot tubs, so it even has to withstand chlorine. I don't remove the seats when I get out of the hot tub. If they both fell apart, maybe I wouldn't be shooting up stars so quickly. However, this product didn't last long on me - 4 months at best. Not acceptable for money. I just checked the prices for both products - 4 months later. The water brick is now $7 more than Belize, but since Belize fell apart I bought the water brick anyway.
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