These glasses are really cool looking and super affordable.  BUT if you wear them on top of your head, the nose piece will tangle in your hair and likely pull a little out.  Not fun.

Also, the nose pieces are somewhat high on the face, so they're very close to my eyes.  Maybe if you have a bigger nose, this would be ok, but I don't like how it leaves little red marks on my face where they touched.  Overall, I like the fashion and they aren't uncomfortable per se, but I wouldn't recommend them to a friend.