The US Federal Government specifically calls out Monero as one of the coins that it hates, which means that it must be quite effective at achieving its goals. So the pro is that you know it works. The cons are nothing specific to Monero, just general criticism of cryptocurrencies. Not being a deep crypto user myself, at least, I haven't heard anyone speak of any flaw specific to Monero that isn't shared by a significant portion of the remainder of all of these coins

Do you already know how a regular Cryptocurrency works and want to know about Monero specifically? Or do you not know anything about Crypto?

pro: if the world devolves into an authoritarean hellscape, people will still have a form of undetectable currency until they find a way to get rid of this

con: this improves the chances if the world to devolving into an authoritarean hellscape