I was an AirVPN user for a number of years until Mullvad came around. I switched to Mullvad and stuck with them for a few years. However, now that Mullvad has gotten rid of port forwarding, I have since moved back to AirVPN.

The performance has been solid with all the servers I have used, even with multiple tunnels open. My only complaint is that the IPs on the servers I use are unfortunately blacklisted on quite a number of sites. Other than that, I am satisfied.