I bought some of these skins for my Centro before, and yes, they do protect the phone just like the invisible shields and such. But I find the Best Skins Ever installed more smoothly, and felt nicer. These colored skins require no water to install, so they have a very unique adhesive that sticks to the phone, although they claim the adhesive leaves no residue when you remove it.
They do the job of protecting the phone, but I never felt like they stuck as well as the clear shields, and never felt as nice either. But they do work.