Well I got a set, I have used them preety constantly for the last few weeks.
They are great, as long as you go through your normal routine of feeding. In terms of not showing under clothes they were fab-much better than disposable or washable ones. In terms of not need ing a bra, they were also great-definitly stuck byut without any stickness etc.
However, if you do start to leak and get a proper let down, then (for me at least) they couldn't cope with it-and added to which I was afraid to use the nipple pressing thing in case I unstuck them! Also if they do leak it comes out of the edges so you get a kind of circle of BM around your breast rather than over your nipple!
In short, great if you don't leak much and need an extra bit of security but (as usual) if (like me) you can leak quite a bit, they just didn't seem to cut it!