I absolutely love this tool on its own, and especially compared to other brands and shapes. I lost mine and the replacements I got were noticeably not as good.
I only rate it a 4 because it can be damaging IF you don't know how to use it. It's better to use after a shower when your pores are more open. It's also easy to press too hard or at the wrong angle, but if you do it properly, any blemish or blackhead can be removed with the added benefit of not getting bacteria from your hands on your face.