Generally, TurboTax is a well-organized and easy-to-use system. Several weaknesses: (1) If you upload documents to TurboTax, it will sometimes ask you for the same document twice and double up on the numbers. (2) If you have used TurboTax for the prior tax year, TurboTax does not do a reasonableness check of this year versus the prior year, so if you leave an item out it will not alert you that it was present in the prior year.