I've been a H&R tax software user for at least 20 yrs. I have had no problems with the IRS, nor my state authorities. I find the step by step easy & through. I find that the software gives me the best chance to minimize my tax bill.
Pros: Easy to prepare, Maximizes refund, Easy to import documents, Fast
This leads you through a well organized path to do your own tax return. I like the included e-filing feature that greatly speeds any refund you may get. I do prefer the stand alone software to keep my data privately secure and to make it easy to do trial calculations and save them for reference. The notepad - calculator feature needs to be made easier to find and use.