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