I received these bottles for review through the Amazon Vine Program. My daughter, who has 3 boys, has used the Playtex Drop Ins for each as well as Advent and Gerber. The Playtex were by far the favorite as they are great for reflux and reducing gas. The drop in liners are convenient, as you just throw them away after each use, ensuring a clean bottle. Many store brand bags work well with these bottles and will save you money. Biggest downside to ordering online is colors may vary. Who wants a pink bottle for a baby boy.