Title: Don't work with glass bottles
Product review: The rubber expansion ring that is supposed to engage the inside neck of the bottle doesn't expand enough and/or expands irregularly. So it doesn't stay in place or seal the bottle. If there is any pressure in the bottle, e.g., soda, it completely or partially pops out. Even without pressure, it doesn't seal. Other kinds of level stoppers work, but these don't.
Would you say this review depicts the product in a flattering or unflattering light?
