Extremely simple in terms of design, and convenient to take it in hand (two lateral notches). The glass is very strong (fell once and not broken). The nipple system is not bad at all, especially the speed teats (not included in principle is that provided single-flow, correct for the first few months but soon enough). After that always depends on the children, some have very strong preferences. Many teats compatible commercially. Really a good product. I bought several and these are the model I use el more.
