One thing I wanted to note not mentioned by other reviews is that this offer puts you on the free plan (20GB/month). The free tier (as opposed to the PRO tier) does not allow generating manual configs (like OpenVPN, WireGuard, IKEv2, etc.)
This means you must either install their dedicated client or their browser extension, you can’t use the OpenVPN community client or Windows’ built-in VPN client.