My friend's toddler lost her life in the bathroom, ever since this tragedy, I have been vigilant about using safety locks. My son has Autism and is fascinated with water. He does not have a sense for danger. So, naturally I wanted to protect my son from the water in the toilet. I have used Safety 1st products in the past for my daughter and was satisfied. I followed the instructions on how to install the Sure Fit Toilet lock. I did not have an issue installing the device but questioned whether the suction would be durable in the long run? After my first attempt of using the device, it just fell off. I was so upset, my money had gone down the drain. Attempting to fool my son, I placed the device back on the toilet. I instructed my family to take it off and on each time we use the toilet. Unfortunately, my son figured out that he can simply take off the toilet lock. I give this device a big thumb down. Effectiveness If my son can take the lock off on his own, it's not a safety device at all. Ease of Use Poorly designed. Safety Non existent!