This is in my top 3 favorite TV shows. It's able to put ethics and philosophy in a fun context and the twists the show makes are tons of fun. Also, I really appreciate that there was an initial story arch decided, and they ended the show on their terms, not keep extending it into infinity (which is very appropriate for this show in particular). This show completely understands that in order to be happy, humans need to also be just a little sad, and it achieves this perfectly. If you have not seen this show yet, do it!