I run proton w/ netshield in combination w/ ff focus as a default browser, with all blockers turned on, for general use. As others said about battery use, about the same as any other VPN. Turn off either netshield or blockers and it’s terrifying how many annoying ads are in the avg. site.

Rock-solid and largely issue free for me for many years. I remember once having a site not accepting usernames from the “@protonmail.com” but the “@proton.me” worked w/o issue. Not bad for my most memorable issue in like 5 years.