Hi has anyone tried these. My sister is pregnant and I bought her some the other day because they were on offer. They are similar to the TT Closer To Nature ones. She is not breastfeeding so not sure if I really needed to get this shape anyway. I thought they would be ok though until I saw one review on Boots saying they leak really bad. If they do leak I might take them back and get some Avent one as I never had any problems with them. Any reviews? Thanks