I'm officially a Goody Spin Pin junky. I keep them close by at all times, and they've effectively replaced my ponytail holder.
1. Very easy to use
2. Extremely strong - they really hold a bun in place!
3. Gentle - the pins don't get tangled up or yank on my strands the way a bobby pin can
Here are a few pictures of my favorite hairstyles, compliments of the Spin Pin. Then I have a quick little video showing you the basic Spin Spin technique. I'm still complete crap at "how-to" videos, so forgive my ineptitude and gratuitous elbow shots.
Hairstyle #1: Half Up Bun
Look #2: Kicky Side Bun
Let me know if you use Spin Pins to create any other hairstyles - I would love to see how you do it!