I'm using Surfshark, the one you mentioned. Just like windscribe it supports unlimited devices, one account and use it anywhere you want for no additional cost. It's a new VPN and they do release updates frequently, so pop-ups can be pretty common if you find that frustrating, on the other hand, the features they add are useful. They provide CleanWeb and Split-tunneling, both very useful tools for privacy protection. And their Christmas deal comes with a twist, when you make a payment you can choose to donate to Surfrider foundation to clean up the oceans and Surfshark will double that amount. All that for 1.99$/month, so I'd say it's a bargain.