Courtesy gets an F rating from me. This company took advantage of my trust; it seems to me that the total charge of $535.95 for 4 drains is excessive and their 1/2 lb container of Bio-Cleaner at $48.50 is way too high. It doesn't matter that they have an A+ rating with bbb.org or if their repair men are good. They cannot be trusted to give people a fair shake and that makes them a bad company and I will never call Courtesy Plumbing again.