I am a first time mom.  We use the playtex drop-ins. The biggest pro is that it decreases the gas swallowed by the baby.  However, it's really not less washing.  Milk still gets around the rim of the bottle, so I still end up washing the entire bottle.  So that part doesn't set it apart from other bottles.  A few times people have pushed a little too hard on the bottom of the liner to push out the air and it exploded and spilled all over the place.  Also, all of the bottles come with the low flow nipples.  But, they're working well.  My son takes them well.  It seems cleaner since each...