These actual work well. I had no problems with leaking. They did not irritate my sensitive skin. I wear them when I didn't have the baby with me and if I'm only going to be nursing a couple times while out. They are stuck to your skin and I didn't want to be sitting out in public trying to readjust them. :)
Haven't had to use these yet. According to reviews in the internet they are great, although they will not hold up if you leak abundantly while nursing with the other breast.
I have used these when nursing my last 2 children and will definately use them again with the third - can get by with 1-2 pair - only thing that actually worked