Pros: Difficult for child to remove
Cons: Difficult for parent to remove and are easy to avoid using
I have tried about every outlet cover on the market. I purchased the press-fit plugs because I thought that they would be easier to remove for an adult, but harder to remove for my toddler. I was very wrong. My toddler cannot get them out of the wall, but neither can anyone else! There are outlets in my house that I may never use again because fighting to pull out these press-fit plugs is just not worth the effort.
My concern with the cheaper outlet covers is that I have to use an object (such as a knife or screw-driver) to wedge them loose. This is not really a safe practice, and certainly not something that one would like a toddler to witness!
The problem with the press-fit plugs is that it takes an enormous amount of fine motor skill and pressure to disengage the locking mechanism. It requires pressing at three small points at one time. Then you have to jiggle the plug back and forth to get it out of the wall. By the time you get the plug free your fingers hurt, and you have probably forgotten why you were unplugging the outlet to begin with. Also you are very unlikely to consistently replace to press-fit plugs because they are so difficult to remove, which poses another safety risk.
At my old house, I installed the type of outlet plates that have the twisting cover. Those are more expensive and more time consuming to install, but I think if safety and
convenience is a primary concern to you then it is a far superior product. My daughter is old enough to understand that outlets are dangerous, so I have not gone to great lengths to protect the outlets in our new house. I do intend on installing the outlet plates with the twisting covers when we have another small child.