Great for the fact on getting no air, but a lot harder to clean.

Good but leak These are supposed to be the best bottles but leak horribly! We found that taking the little insert in the middle out, helps with the leaking but then it's kind of pointless since I think that helps reduce air bubbles. My son loves them though.

The bottles are nice but I switched after my son was about 3 months old. They cost a lot, I gave my old ones to a friend and she swears by them.

I tried them . I didnt care at all for this product. It has a bunch of little bitty pieces and you have to have a special little brush to wash them . It takes forever and you lose things . Not the product for a mom on the go or multiples

Way to many parts to clean when you are struggling with an infant, I never felt like they were clean enough to feed her. I switched to the Playtex throw away liner ones I can get all the air out and can throw out the liner.

I tried these with my colicky son. They allow just as much air back in as traditional bottles so they did absolutely nothing to help. Cleaning was a hassle, taking too much time I needed to tend to my family.

I did not like these bottles. They were hard to clean and they leaked a lot.

i want to try this

I used these bottles with both of my girls and they did not seem to work from them. I even tried them with my son who is 3 months and they didnt work for him either. I tried several bottles for him; dr. browns, avent, nuk, playtex ventair and a few more. Finally, I decided to use the playtex dropins (which I had never tried or even thought of trying before), and these bottles were a life saver for my son. No air gets into his stomach, (since you can gently push the bottom of the bag, releasing all of the air out through the nipple), and they are easy to clean. The only downside is having to purchase the bottle liners on a weekly basis. A little more expensive but totally worth the price!!