T.,
I loved my Lily Padz. They really work! I liked them more than the nursing pads that were always bulky. It's true they aren't natural because they are plastic of course, but I like that I don't have a wet diaper like feeling on my breasts all day.
The way they work is to prevent leakage by sealing the milk up by placing the plastic tight on the nipple so it serves as a sealer keeping the flow sealed. It's all about preventing the flow (once started it wants to keep flowing). There have been a couple of times I didn't seal it right or I waited too long before I either pumped or nursed and I leaked. Leakage often occurs because there is rubbing on the nipple and as nature takes it course the milk will come out. If it hasn't been too long and you notice you can just correctly seal it into place. If it has been to long, well, you still have to fullfill your duties as a nursing mother LOL.
Congrats! and Good Luck!
G.