This product is very firm and with a smooth surface. The installation and programming are very easy to proceed if you follow  the procedure that was provided. The feature of having option to create additional codes to provide to other people is a big plus up to exactly 30 is a plus. You can only install or remove the outside handle with the key in the lock and turned to the open position.The problem that enquired due to key option make it too convenient for people to open the lock with a pick tool and pliers in seconds, with no signs of tampering. I would recommend this product to people who have a home based business or need the extra security.