I have used H&R tax software for about 10 years. It is simple and takes the drudge out of manually calculating debits and credits per IRS form instructions. Takes the error out of the procedure.
Generally very good if you are operating within its limits - which most people do. Last year I did hit a difficult situation due to too many stock transactions than the software could handle - but most people will not hit it.
The software works and has met my needs. I found what appeared to me to be an error in the results once. I find much of the help text to not be very helpful. I usually have to go to the IRS documents if I need to figure something out. I keep using it because I'm used to it and don't know that another product would be any better