Hi Maddy, The snap on cases aren't necessarily bad, but sometimes dirt can get caught between the case and the computer and cause scratches. They can also add a little extra weight to the display making hinge feel loose. Lastly, they tend to hold a little more heat into the computer which makes your fan(s) run more and can decrease battery life. I'm giving you their worst attributes and these are all minor. The upside is that they can help prevent dents and scratches. They rarely help prevent any serious damage though. Thanks for your question. Please let me know if you have any additional questions!
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