Mullvad allows using any and all protocols that the user wishes, no traffic is restricted.

WireGuard is an extremely simple yet fast and modern open-source VPN program built using the latest cryptography. It's faster, simpler, leaner, and more useful than both IPSec and OpenVPN.

In the event of a DNS leak, not all traffic is routed through a secure network. Mullvad helps solve this issue by offering DNS leak protection.

When signing up, a sufficiently long random number is assigned and given to you which serves as both username and password, without any need to provide a name or e-mail address or any other identifying information.

According to Mullvad, they retain no traffic information or metadata. Here is their statement in 2014 when inquired by TorrentFreak if they store any logs that would enable linking an IP address and a timestamp to a user:

No. This would make both us and our users more vulnerable so we
certainly don’t. To make it harder to watch the activities of an IP address from the outside we also have many users share each address, both for IPv4 and our upcoming IPv6 support.

Bitcoin, cash, bank transfers, PayPal, credit cards are accepted.

Mullvad customer service is helpful and responds quickly.

One of the things that makes Mullvad's free trial attractive is the lack of personal information asked to sign up. Once downloaded, the free trial lasts three hours.

It's possible to set up the software to disconnect from Internet in case the connection to the VPN service is lost to not expose traffic in case of service failures.

Allows hopping from one location to another for additional security. This is great because everything "hops" through multiple locations effectively providing an additional mask and making it harder to trace the route back to the source.

The platforms that Mullvad can run on include: Windows, OSX, Linux, Android, and iOS. Additionally, Mullvad offers a source code that allows the program to be run on virtually any system.

Mullvad operates out of Sweden, and so is not exposed to the same privacy-corresive laws as it would be if it were in the US or another “Five Eyes” country.

autogenerated account number, no email accepted

Easy to set up Windows client.