Avantages
Strong emphasis on ethics and good backup for tax pros on that. Lots of educational support. They will cover the costs of training and testing to become an Enrolled Agent. They also provide unlimited tax classes through their platform. That does require a small annual fee. There's a lot of control over your work schedule. Before tax season starts, you let them know the days/hours you can work and then they won't schedule you when you aren't available. Finally, you can exercise a lot of control over how much you earn by "leveling up" (taking classes and tests that make you qualified to do more complex returns). Pay is partly hourly, partly commission, with incentives for leveling up. You are guaranteed to earn a certain amount per hour, with the ability to earn more depending on how many returns you do and how complex those returns are.
Inconvénients
They've been moving away from in person classes, to online self-study. This is convenient in some ways because you can study whenever you like, but makes it really difficult when you are having a hard time understanding something.