I haven't; it's supposed to be super secure but it seems complicated.

QT is simple and clean, I respect that.  Blockchain too.

I'm in general tech savvy but I have not yet figured out the "paper wallet" thing.  If I mess around with things too much without understanding them, I'm afraid I will lose my coins in cyberspace.

I'm a fan of 2 factor authentication using Google Authenticator (on blockchain as well as google).  Big security boost.