Well I only have the glow in the dark one in because I don't like the way the steel balls feel when they hit my teeth. It seriously started to annoy me after awhile. I got it because I was curious to see what it would be like to have my tongue pierced. My ex was curious to see what it would feel like when I go down on her, but she didn't notice a huge difference other than it always felt real good for her with or without it.