I have been around Playtex bottles for a little over 16 years. That is hard to believe beings how I am only twenty eight. However they were used with my niece and nephew. Then they were used with my two sons. To be honest some of the bottles from my niece and nephew we actually passed down from them. These bottles last a long time. All you have to do is change the nipple. What nipple does not wear after a while? That is the good thing about these bottles, since they use liners they really have less wear on them and they last a lot longer. With these bottles I can just pop a liner in add the ingredients and feed. I can then toss the liner once I am done, I do not have to worry about a really smelly bottle if I forget it in the car or out a long day. That is the biggest plus to these bottles, the convenience of the liners. I have had different versions of these bottles classic and new. I will always recommend both to anyone. I have tried other bottles as well for various reasons but I come back to these. Oh I almost forgot..... These bottles you can PUSH THE AIR OUT!!!! Yes you can push that air out that you do not want to get in your babies belly! How AWESOME is that?!