I have been using TurboTax for a few years and the best thing about it is the guidance. I have tried other services but this one is straight forward and easy to use.
Compared to past years the product has really regressed. There were times where I deleted information and after re-entering the data I got different results with the same information. I still don't understand a couple of the numbers in a couple of places and believe they are probably incorrect but had no way to modify. I hate that you cannot see the return forms without generating a read-only version and cannot enter the data directly on the forms if you believe something is incorrect. I used the free version so I guess I got what I paid for.