Current locks: Medeco M2 with master keys. It's been a good lock, well made. Recent vulnerabilities and failure by the manufacturer to own up to the problem have lowered my opinion of the product. I will likely move to a different lock system the next time I upgrade. I may move to an all electronic system, perhaps 2-factor authentication with an NFC RFID physical component so I don't have to mess about with a key to open the door. Just have the token nearby and use a password. This is still not as good as a OTP 2-factor system, but I am actually not looking for high-security, just good security and easy to manage guests and key changes and key revocation.
Next lock of choice: EVVA MCS