I've always had trouble wearing earrings because the posts poke the back of my head (especially when sleeping or on the phone).  I saw these and thought perhaps the gold ball (worn in the back) would solve the problem.  IT DID!  These are so comfy that I never even realize they are in.  They're not so gaudy and huge, either.  They are perfect.

Yes, it takes a little longer to get the ball to match up to the threads on the post, but it wasn't a problem for me.  However, I'd recommend them as "keep in" earrings rather than ones you change daily.

I was worried that these would be more "toddler size" and wouldn't fit in my adult ears, but that is certainly not the case.  I love these.