My friend is a hairdresser and needed a guinea pig to practice on, so I volunteered. I only had to pay for the hair, but it was still expensive. I want to say it was around $300-400. It took hours for her to put them in, and they were the glue in kind.
Plusses: my hair looked really pretty, and the extensions blended well with my hair and looked very natural. I also have very thin, fine hair, so the addition of the extensions added a great deal of fullness.
Minusses: The glue melts when exposed to heat, so after just a few weeks, the extensions began to fall out when I would blowdry on high, or use a straightener. It's difficult to rinse, and leftover shampoo is very itchy. You aren't supposed to expose the extensions to chlorine, so no pools or waterparks. Because my hair was so thin and fine, and my head is really small, the extensions were applied close to my face, so pulling my hair back into a ponytail was never a simple process. I had to make sure to pull hair down to cover the bonds. My extensions only lasted four weeks, as I discovered that I was *possibly* allergic to something in the bonds, and my scalp was ALWAYS itchy. You have to care for the extensions much more extensively than your own hair, as they will dry out and get matted if not properly tended. Sleeping on the bonds was extremely uncomfortable.
I didn't experience the hair loss, and when the extensions were removed, my own hair was fine. (and thin, just like before...lol).
All in all, NOT worth it, and I'd never do it again.
-Penny