Review (3/5): Does what it advertises, but has some less-than desireable side effects
I'm a hairdresser and I bought these for a brides hair I was doing this summer. She was self conscious about the flat spot on her head, and her hair was too healthy to hold a backcomb, so I thought something like this could be a good solution. These things hold their place in the hair on their own surprisingly well, and they don't seem to budge, even without the use of product/backcombing/pins. They didn't look like they would, but they did! The ONLY drawback was, when you use them with products/backcombing/pins...they're REALLY hard to get out. They tangle up in the hair no matter how cautious you are when removing them. Also, because of where they're typically placed (somewhere deep within the dark abyss of crown-area), they can get intertwined with nearly every piece of hair on the head and make it a pretty big job. Even as a professional who has experience with these types of self-induced tangles, it was rough. I can only imagine someone with less experience trying to do the same and ending up in a much more dire (pixi cut-esque type) situation.
All this to say, her hair looked amazing for the wedding, and this product definitely helped me accomplish what I had set out to accomplish in buying it! I would recommend it to people in the same situation, but caution you to proceed with an understanding that it'll take 15x longer+ to get it out, than it did to put it in.