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Chicago Consumers' CHECKBOOK (CHECKBOOK.org) will save you trouble, time, and money. It's the independent, non-profit, no-advertising source of ratings and advice on hundreds of types of services you use in your everyday life. See list of services covered.
CHECKBOOK only publishes ratings for a specific firm when an adequate number of ratings of that firm (sample size) is reached. Therefore, not all firms in a given category will appear in CHECKBOOK's ratings tables.