For the first time in the many years I've bee using TT, I owed federal tax. It took a lot of looking to check this in TT and even more looking to find the quarterly payment vouchers. There seemed to be no step-by-step to determine if I have to pay quarterly in 2014, or if I could make payments if I wanted to. The form for calculating estimated taxes is too complex. The Fed calls the quarterly vouchers 1040-ES while TT calls them 1040ES 1, 1040ES 2, etc. Hence a search on 1040-ES comes up blank.
Using TurboTax is still easy to use and carries forward all your information from last year(if you used turbotax) and all you need to do is have the program step you through each step and you can breeze through your federal and state taxes.
I have been using TurboTax for twenty years. Program improves every year. Lots of help functions and definitions built into each page. Especially easy to use for non accountant types.
I live in Illinois, Susan lives in Virginia and has no financial connection in Illinois, but TurboTax carried some of my 2012 financial data from Illinois into her 2013 financial data and I could find no way to negate it.
Generally very easy to use, especially year to year. However, if your income varies and you are penalized for underpayment of estimated taxes, there is no easy way to minimize the penalty except by going to the forms themselves. The step by step method should ask those questions.