Given the task definition and input, reply with output. Given an English language product review, determine if it is a Good Review or a Bad Review. A good review is one where the product's review has positive tone and Bad review is one where the tone of product's review is negative.

The design is simple and the cup is attractive but I don't feel that the insulation works as well as it should. If an ice pack remains in my car or if it's a hot day outside, sometimes you have to open up your window for longer than 5 minutes, not exactly comfortable. It's also difficult to clean because there's no lip on top of what looks like the traditional bottom layer found with other travel mugs. This tumbler does do a good job keeping cold things cold.
Good Review