. Its is fast. It is not the fastest out there, but it does its job well.
2. It has a huge number of servers, about 5000+, which is great.
3. It has a very clean and minimalistic UI.
4. Comes with a kill switch.
5. Its cheap. Sometimes, its ridiculously cheap, especially during offers.
6. More servers are added from time to time, and previous ones are improved regularly.
7. Comes with lots of protocol options. For most, wireguard will be the best option, as it's the perfect balance between speed and security.
7. Comes with a built in ad-blocker.
8. Comes with some additional great features like obfuscated servers, P2P, tor over VPN etc.
9. Great customer support. Review collected by and hosted on G2.com.