Built-in VPN servers of Opera browser is fine.
Mega vpn. Very cheap and good option
Privatevpn with costumised physical server with WireGuard . Been 10 years now and still awesome
Nord, but when it’s time to renew, I’ll probably switch to one that can do port forwarding.
I use the free one built in my browser. (Brave) Never had a restraining letter.
I use Nord and Torguard without any issues
I use Express VPN. been with them for at least 4 years. No issues whatsoever.
I use surfshark - as I need some good vpn to stream OTT applications from different country. So far so good.
Before this I was using windscribe and other one before Jr was bankrupt and disappeared.
AirVPN. Just load up on one of their sales they have yearly. Nothing compares for me. I rarely, if ever run into any issues.
Was happy with Mullvad but switched to Proton because of port forwarding support. Both work well for me. Mullvad was much cheaper though.
tunnelbear cuz my friend suggested
I use nordVPN, but i’ve really been thinking of switching. No port forwarding 
so it feels quite limited in regards to torrenting. But i’m quite new to torrenting anyway, and i already had nord before getting into it.
IVPN its a paid for service, a friend pays for it but had extra slots for it so woo! lol
Been using Mozilla VPN for a while now
ExpressVPN - can use on mobile and desktop (one subscription)
I’ve used NordVpn for several years, never had any issues… But i don’t trust their NO LOGGING policy tho 
or anyone elses either… so be aware. And Btw you can make your own VPN, if you know how…
Is the built-in Windows VPN sufficient? Or is a paid VPN service like NordVPN worth it?
I recently took advantage of a Black Friday deal and subscribed to NordVPN for about $4 per month for the next two years and three months. I use several of its features, including split tunneling (so my Google Nest devices bypass the VPN), the P2P specialty servers (for torrenting), the NordLynx protocol, and a custom DNS server (Cloudflare).
I use Windscribe. No issues.
bounce around for best deals. i never stick with only one vpn.
Proton is the only real answer