Pros
The pros list is slim anymore. If you have no skills, start out as a seasonal and enjoy the two months off. Then, maybe you'll transition into an "associate" level position where you'll learn some worthwhile skills. Learn those skills...but leave Block and find a company that will treat you humanely.
Cons
So many...if you don't get and use their Emerald Card prepaid debit card, they'll fire you. If you don't do your taxes with them, they'll fire you. If you don't get your time corrections in by the end of the pay period, they'll fire you. Bill Cobb, this jerk of a man that runs us into the ground, also known as the CEO, sends out stacks of threats against employees. He's a tyrant who is laying off all of the workforce so he can pad his severance check before he's sent along on his way. He treats employees like they don't matter. His business leaders treat employees like they don't matter. Oh, and if you are seasonal, you don't matter at all. You don't get a raise, you don't get benefits, you don't get holiday pay, you don't get vacation, you don't get respect...you get nothing. Find another job. This company is trash.