Instruct: Classify a review into positive or negative sentiment.
Query: A must have for those trying to quit

I'm writing this as my Margarita sits on the shaker, which is completely stuck and will not come apart. I've tried all angles, shaking only for 5 seconds and the damn thing gets stuck each and every time. There is no science behind this, and I'm sure I'm doing everything right...it's gotten to the point where I've had to add boiling water to the damn thing so it comes apart.The problem could be the thinness of the metal part, which contracts when it gets cold incredibly fast and creates the problem.In other words, if you are trying to quit drinking, this is a must get.