i googled them. their blurb doesn't even make sense "is recommended for breast fed babies to help avoid nipple confusion." followed by "a familiar nipple shape that babies love." -the action of sucking on a dummy can be different, and the outcome is different to feeding from the breast, so why is a familiar nipple shape going to reduce confusion? And if the mother's nipples are not the same shape as the dummy, then it won't have the familiar shape and so will these babies be confused?

If you want to breastfeed, avoid dummies if you can for at least the first 6 weeks. Almost all products that are advertised as 'close to ' breastfeeding are just advertising gimmicks with no benefit to breastfeeding.