You don't have to go to the airport to get it or go somewhere to purchase it, and you can use the data right away by scanning the QR code that is sent by e-mail
Because it's a digital version of a SIM card (eSIM), there's no risk of losing it and there's no need to throw it away after using it.
You don't need a passport and you don't need to go through an inconvenient process like other SIM card services.
Unlimited data available (Network speed slows down after using 500MB/1GB/2GB per day)