With no explanation, label the following with either "negative", "neutral" or "positive".
Called them instead of our local small business plumber for a bubbling toilet and sink because it was a Sunday, they snaked the first floor toilet, said they couldn't find the clog, recommended adding vents, doing a camera/snake the next day from the main line in the basement... quoted at $1275 for the bathroom venting job and $875 for the camera and snaking.
neutral.