The mini vibe will tickle your shaft while vibrating the textured fin against her clit and vibrating a textured ring around your balls. And since this item is clear, it's easier to forget that it's there.
I wouldn't have as much fun with this toy if it were say, ultra-violet pink. Because I'd eventually see that I had a plastic fin riding against her clit and an ultra-violet pink ring around my balls. I'd see that, and I'd think about that. I'd also be thinking about how retarded it looked. I'd be hoping she didn't think it was retarded too.