Customers report mixed opinions on the fit of these pouring spouts, with some finding they fit perfectly and others experiencing issues with them not fitting their bottles or popping out. The product is generally praised for its functionality and ease of use, effectively serving as replacements for worn-out spouts and making pouring liquids like olive oil and balsamic vinegar a breeze. Reviewers also appreciate the usefulness of the spouts, particularly for flavored syrups and oils, with the included caps being a valued feature for keeping contents fresh.