I have to disagree, and I know we have had this conversation many times here. In the end do what makes you feel comfortable, but having a thin wall piece of metal holding up a 1500 lb motor does not give me any piece of mind. The torque of the motor running is putting way more stress on the transom than when trailering.
I have a 200hp Evinrude and have never used one. The new Skeeters all come with the wedge and most other new boats have something similar.
Personal opinion is the transom saver has some good marketing, and lots of people think it will work. If it makes you feel better go for it, but I don’t think it will do anything.