Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Overheating an issue

The manufacturer claims that the vents allow for adequate ventilation. I used the case for 1 month without an issue, but today experienced performance issues associated with overheating. I removed the case, the MacBook was noticeably cooler shortly afterwards, and the issues went away. I can't be certain that the case was to blame but overall, I don't think the price is worth it, and I don't feel confident enough in the ventilation to ever use the case again.Also, the case changes the weight of the balanced screen, making it move due to accidental shifting more so than if the case is not on the computer.I took off the case right before logging into amazon to write this review, and for the first time today, the computer is not hot to the touch, so I'm pretty confident the case is to blame.