This product is really cool design, quite classy if I have to say. The naturally shaped nipple is a good design for easier switch from breastfeeding to bottle feeding. The easy mix is quite an awesome idea when you are formula feeding plus the on the go powder cap is perfect for a busy mom like me. The only drawback for this one I would say is that the bottom of the nipple area can be pushed back easily inside when your baby is quite older like mine who is an 8 month old and causing a spill. It happen in 2 days right after I got it. But overall I love this product but maybe more suitable for baby ages 0-6 months.