I am a long time express VPN user, well before this latest marketing blitz. No doubt; for me it has been a great product that i have run on all my devices for years, blah blah.
For those that are super security concious with a windows machine, there is an issue that they're attempting to diagnose as we speak where after a change in the cpu clock speed in bios the app requires the activation code again on boot into windows. This is the app that blocks internet communication until it knows its through their tunnel. Those issues are usually relegated to %appdata wipes: but they can't currently explain to me why. ExpressVPN is the only app that requires the login after the change.
Given a tiny bit of knowledge, don't see how as of now.