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twiigss Money magazine used to take some "interesting" taxes to a variety of tax preparers, including CPAs, H&R, etc., and they would show the range of prices AND the range of tax calculations. It varied wildly...*quite* wildly.
Some H&R Block preparers got it right/close to right, others got it wrong, and the same was true of more expensive services.
That added to my own desire to know what was going on, and just do it.