If you choose not to work, you pay back the money plus 8% each year. It's not a lot of cash, so the interest won't be too bad. Also if you take the money for 4 years then work for them 3 years and quit, you have to pay back the money for all 4 years.
I actually just applied for a Walgreens scholarship this week and I graduate in 15 weeks. I need to get a year of working experience, so I decided to sign on with Wags for one year. Since I'm going to be working for them one year, then I may as well take the extra cash. They also do a NAPLEX review for you to pass the boards.