Negative Positive
Title: Great idea. Poor execution
Review: The bottle is great and PBA free. The vent idea is great, but does not work in preventing a vacuum, like the old Gerber wide silicone nipples that vented throuh the base. The baby sucks until a vacuum is created, and has to release for air to get back in. Expected more from such a reputable manufacturer. Do they test these things?
Is the review positive or negative? 