Avantages
The training to start as a tax pro is pretty good. If you get into a good office (luck of the draw) you will learn a lot in the first couple of years. But there are a lot of bad offices with weak managers and very catty tax pros.
Inconvénients
Horrible management. As this is a seasonal job, the managers they hire tend to be unemployed customer service people. You don't have to do taxes to be a manager here (crazy, right?). So most of the managers don't know taxes, and many of them don't have many management skills, tax season is high stress. Pay is poor. After you have a couple of years of experience you can do much better elsewhere. This is compounded by HRB's high prices for services. The best customer complaint is how expensive the fees are.