It's taken me a while but I finally have the mac I wanted, a 2012 13.3" macbook pro. I have a keyboard dust cover which all my apple laptops have had. I work in dusty environment (basement) and wondered do any of you use dust covers for the ports? They are on ebay for very little money. I have bought a set for the pro and just like to know if used by anyone. There seems be a lot on ebay for sale so there must be some kind of demand for them. They are silicone so I don't think they damage the laptop, bar maybe the headphone port. It might push the internal connectors back a little if left in all the time then may not connect with headphones in future. This is the only issue I could see in using these.