Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't buy it - DVDs may not work

Got this set brand new, and some of the DVDs do not work - pain in the ass to get them replaced. Searched online and apparently many people have this problem with Insanity. If you give it as a gift, you have to make sure people know all your info so they can get the replacement DVDs if they'll even give them. I guess you have to just buy them yourself if you want them - and definitely don't buy through a 3rd party!