Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Spa Booster Seat

This seat is not as advertised. The cushion is difficult to fill because it does not have a valve in the stem. Therefore when you fill it with water, it shoots back out on you while you work to plug it. Secondly, it does not stay put. It wants to lift you off the seat. I returned mine and was not refunded the original shipping cost of approx. $6.00. So I'm out $12. Yuck.