The H&R Block tax software is a solid, easy-to-use product. It walks you through the tax return, does I rated it four rather than five stars because there were some areas I wasn't sure of and it took some reading to determine what to enter, but that is likely the fault of the tax code complexity more than H&R Block. Also, I would prefer if the cost to e-file for state tax was included in the purchase price instead of being added on when you file.
I've also used TurboTax, and prefer the H&R Block software as somewhat easier to use.
It has done everything I needed at a reasonable price. Easy to use. Quick. Saves data from last year and I've used it for years. I've not yet needed their help with an audit (knock on wood) but I assume it would be helpful...
Pros: Easy to prepare, Easy to import documents, Fast
When I did my South Carolina state tax by hand it calculated much differently than the H&R Block software. I used the hand calculation since it was more beneficial.