This is a good exchange if you are outside of the area supported by Coinbase, such as South American countries, especially Argentina.
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Support staff conducts with seriousness and professionalism, and they are very watchful of regulations. They will be most likely operating for a long time. This is the biggest draw for people who want to declare their crypto for tax purposes in South America.
Pro It also allows you to pay your bills
You can pay your utility bills and recharge your prepaid phone using the site.
Pro You can buy multiple coins
You can buy BTC, ETH, LTC, XRP and BCH.
Con They deal primarily in Argentine Pesos
Although you can load up using USD as well, there are very few options for transferring USD.
Con They are overzealous of regulations
Each time you make a money transfer, or fill your wallet using any of the methods available, they will ask you for confirmation pictures, receipts, etc. This is common the first time using most exchanges, but Satoshi Tango asks you to prove and verify EVERY TIME. Not fit to buy bitcoin on a rush.
Con Its trading section is VERY rudimentary
It doesn't even have charts.