They look discrete, you can't see them through your nursing bra or top.
I had a heavy let down and ground they leaked a fair bit.
Security / Hygiene
Quality / Performance
I found the nuk breast pads very easy to use, very discrete and they're lovely and soft. I had a heavy let down and they did leaks quite a bit, so not super absorbent. I also found they came un stuck from my nursing bra, which was quite frustrating sometimes.