We have purchased Turbo Tax, 3 years in a row. I am not a glutton for punishment! I fill in the data. It is fast and truly easy. We would not continue to purchase Turbo Tax if it left us with doubt in our mind about taxes.
What's great about it: prefill last years data
What's not so great: I did get confused a bit on my state return with an explaination
It would be nice for returning customers to have a voice guide to compare last years return against this years return . . . would help "jar" your memory of any forgotten items.