I have a few metal tips, but I prefer the plastic. Maybe its the cold hardness when I first pick it up? I also remember DH telling me I was going to chip a tooth using one as much as I put that thing to my lips. All I could think was, "Gee honey, thanks!" Then the first time one hit my tooth I kind of freaked. Now I only use the plastic. I am a wimp I guess, don't like the cold and scared of chipping a tooth 
