I've used Block tax software for longer than I can remember, for my family and relatives. I always use the previous year's return as a starting point. I need Premium for our return, and it does fine for the others, too.
Pros: Easy to install, Easy to fix issues, Easy to prepare, Maximizes refund, Fast
Significantly helps make tax filing easier. Some of the more complex issues (sale of property used for rental inc) were not handled totally correct, so had to make some adjustments.
I bought the premium installed package + 1 state, rather than use the online version. There were glitches with the installed software. As a resulted, I had to print my returns and incur additional costs with Fedex, instead of being able to use the included e-filing option.