Pros
This job does help with your confidence in talking with people, as you spend your day walking into businesses trying to convince strangers to buy office supplies. If you want to make ANY money, you'll have to learn to rattle off your sales pitch 50+ times a day to people you don't know. The nice thing about this though, is everyone except the CEO is in the same boat as you, so you have a good support system at the office. That being said...
Cons
Let's start with the 100% commission. There's nothing much worse than going door to door for 9 hours, making no sales, and essentially losing money on gas and lunch. The company takes ZERO risk in hiring you. You pay for your own gas (and you drive A LOT), your own food, and your own supplies. You will make sporadic sales but the commission off these sales minus your personal expenditures during the day comes nowhere near a living wage.
The thing that gets me the most though is that they skirt around these details in your prelim phone conversations and interviews. No one will tell you about the hours, and if you ask about the rate of pay, you'll get a 5 minute convoluted answer that not only doesn't answer your question, but changes the subject entirely. If you do take the job, it doesn't take long for that "I've been duped" feeling to set in.