I have been using H&R Block tax software for over 20 years. It has simplified the tax process so it taxes an hour or two instead of days. The IRS has always excepted the forms with out any questions. Once you start using it you will not want to use anything else.
Pros: Easy to prepare, Maximizes refund, Easy to import documents, Fast
The software is pretty solid as it is, though it would be nice if it would point out a lot more loopholes for us to consider pursuing. Saving us money needs to be prioritized over other concerns.