Hard to get out.  Keeps hair secure, even when you're done.
I love this concept and that's why I purchased these.  I think with some fine tuning these will be excellent.  Currently the little balls on the end -- the ones that keep it from scraping your scalp as you twist the pin into your hair do -- are attached in a way that catches the hair on the way out.  Every time I want to take these out of my bun, they get wound up and are very difficult to get out without pulling hair out.  That said, it certainly keeps my hair secure while it's in there.  To the manufacturer -- excellent product, great idea. bad execution that can be easily fixed.  Then I'll buy them by the dozen!!!
Rating: 2 stars