The Playtex drop-ins are a good product for busy moms! We didn't know what kind of bottles our little guy would like, so we decided to start with these, and we use them all the time! One of the downsides though, is that it isn't a very environmentally friendly product - a lot of waste! It also does get to be expensive, purchasing all the liners. Our son likes the bottles though, and it is really easy to take them and go. I like how there are two different sizes - short bottles and bigger bottles. It works well to start with the small ones, (or just use them for "snacks"), and move to the bigger...