I love how easy it was set up, as well as using different environments in order make my AI learn more efficiently! It's also fun because you can play against other AIs (and sometimes humans). As of now there are not many people who know about this program so if your interested then go ahead with openai gym!! The only thing i dislike atmosely would be having some bugs when running through training sessions but these do get fixed pretty fast by their support team :D Great way too train an agent quickly without going into detail every single step required :).