Instruct: Classify the given review into positive or negative sentiment.
Query: Starts out great - ends flat

I purchased this wedge a year ago and it started out working just fine. However after nearly a year of use the bottom portion is essentially flat which means I slide down it more in my sleep which defeats the purpose. I'm now shopping for a more durable product. If you only need it for a limited time then this will work well, but I cannot recommend it for extended use.