Pros
Fast (i mean really fast) promotion if you have that silver tongue ready to sell sell sell. Decent commission on items that sell themselves. I was the best at this job for 5 years that i was there. I made 40,000-55,000 a year just selling,cleaning a bit,and hooking up with the mall girls.
Cons
Most likely your boss is going to be some 21 year old idiot who is on a power trip because he makes 900 every 2 weeks. No overtime here..only half time. If you do not meet the sales percentages on a consistent basis be prepared to be replaced by some other monkey that can run a register but can outsell/lie better than you can. They keep lowering Pm's (promotional money) on Gnc brand products (which is now 1% now---used to be 3-5% when i was there). You have to sell their brand or your out.