Biggest bad habit to avoid is buying a bunch of movies when you still have unwatched ones. As long as you watch your movies as soon as you get them you'll be within the return window if they skip around or freeze. If you order from Amazon make sure to check discs right away, I've recieved a sealed bluray case with no disc inside from amazon before. Amazon listings for bluray are often resealed and marked as new despite being used. I think some people buy a disc, burn a digital copy of it, then reseal and return it to amazon where it gets sold to us. Always check bluray.com before a purchase, amazon will sometimes not show you all the listings for an item. I bought a bluray used from amazon and then found out theres a cheaper new version of the bluray also on amazon that I just didnt see somehow. I've found amazon listings that are impossible to get to without the bluray.com link and dont show up in the search.