I have been using H&R Block tax software since it was called Tax Cut. I have never had the IRS question a return because of a problem on the part of the software. Excellent quality and reliability.
Software is easy to use and instructions are easy to follow. Also, it gives you updates about what the software is doing along the way, and has breakout sections to go to for more details. Sometimes, tax explanations not as informative as what irs.gov has.
I have been using H&R Block tax programs for over ten years and have been completely satisfied. The programs are easy to follow. You also have access to a tax expert if you have a question via chat.