I started using Turbo Tax when it was Mac-in-Tax and I've obviously been a happy customer. It's easy and totally up to date with free upgrades. I don't know why anyone would pay to have taxes done!
What's great about it: Great directions and lots of information sources available.
What's not so great: Cost of state e-file convinced me to file by certified -return mail.
The software walks one through the most common tax situations without taking one through the tortuous route of managing the less common situations.
It is simple to fill out the form as one goes along, and inputting all the details that apply to oneself (SSN, address, etc) is as simple as clicking a single button if one has the previous year's files handy.
When one purchases the software for Federal Filing, it includes preparation for a single state. The Federal e-filing is included, but in order to file one's state return, one pays an additional fee.
It may be petty on my part, but I think it should be all inclusive for filing for a single fee.
TurboTax helped me complete my taxes in just under a couple of hours. The step by step guide helped keep me focused.
My taxes involved minor stocks, dividends, and my W2. My deductions included education, vehicles, moving, and donations to charities. TurboTax handled all of them with aplomb.
What's great about it: Step by Step. Clear Explanations.