I have never used a changing room in a store to feed my baby but i do often breastfeed my baby in a baby changing room as i find it easier. I wouldn't even think of breastfeeding in a store changing room as to me thats not what they are for. Even if i needed to leave the store i wanted something out of i would ether go to a baby changing room or my car. I'm glad zara have said they would allow breastfeeding in their stores but i would feel under pressure to rush as i know people are waiting on the room.