It works very well when you behind a firewall that blocks VPN, actually is the only one that worked on Linux for me. Although it doesn't work on streaming sites, it works to access Geforce Now in Brasil.
It rarely works. And it doesn't work if you'd like to watch Netflix contents that are available in other countries. Also, it doesn't have a price advantage. You can find a better one. I have subscribed Lantern for 2 years and become much more disappointed. The connection and the service get much worse.
I have been using Lantern since 2015 and the PRO version since 2016. When it worked, it's fast but it's often blocked and have to play catch up with the censors. Still it used to be better than other VPN I see listed here and that will only admit it doesn't work in China after you install them! Since the Coronavirus and version 5.8.1 (currently 5.8.3) the situation has changed. Now Lantern (Windows version) use most of my CPU and can't connect at all. I wasted countless hours trying to find out was wrong before noticing I wasn't alone and older version didn't have this "feature". While support used to answer sometimes, I got no feedback on this issue despite emails and opened tickets. As Lantern doesn't communicate publicly on those issues, it's not possible to know if the tool has been compromised. I wouldn't recommend it as long as the Lantern team doesn't acknowledge the problem.