I was most annoyed with the lack of software updates early in the filing season. I was also frustrated that my version for Mac would not update through the application. I was forced to go to the web site, search for the update, download the update and then manually install.
I have been using H&R Block tax software for 20 years or more and I'm not about to change now. There is not any problem using this software. The IRS has accepted my filing every year without any kickback.
Pros: Easy to prepare, Easy to import documents, Fast