I've been using Mullvad for the past few months. Have not had many issues with it aside from the 5 device limit and the removal of port forwarding. I'm currently looking at Private Internet Access as a potential replacement. It looks like it offers 10 device limit and port forwarding included with the price.

Anyone using PIA? How's the experience?

Edit: Probably should have mentioned, feel free to offer any other recommendations, I'm not attached to, or against any specific recommendations. I would like it to have a GUI available on Linux though if possible.