Happy Customer
Pros:
Really good exchange rate. Although they charge you a non capped percentage in money transfer fee not a fixed amount like some banks, the exchange rate is so good you will end up saving money on international transfer.
App and website are very user friendly. 
Can have a wise card which you can use for shopping online and in physical shops.
You can open jar which is a smart way to save money for specific target e.g. holiday jar, car deposit jar, etc.
Cons:
Although well established in many countries few countries remain out of reach.
I wouldn't keep a big balance and leave for too long with Wise because they offer no interest on saving and are not covered by financial services compensation scheme.