I purchased one of these after seeing it used on a friend and a beauty spa place overseas and being rather intrigued.
I find it does work well at getting out blackheads and the like that are fully developed but it can be a bit dangerous for someone like me who doesn't know when to stop. It's not pain free and I have ended up scratching my delicate skin with it so I don't use it as much anymore. It is easy enough to use you just have to be as gentle as possible with it in my experience. Because of this think it is more suitable for those with blemishes that are more on the surface than deep in the pores.
I have a few of these in my house. They are great and easy to use! Rather entertaining too.. for the people that way inclined. They are perfect as they don't break or scar the skin, just remove the targeted blackhead.