While workaholics report having great job satisfaction and creativity, they also experiences high levels of frustration and exhaustion, according to a study by Florida State University.

When it comes to taking time off from work, 60 percent workaholics say they feel guilty. Not surprisingly, workaholics also believe they put forth more effort than other employees, but they are more open to helping others, as well.

"We found that there is an optimal level of workaholism for job effectiveness and positive health," said Wayne Hochwarter, the Jim Moran Professor of Business Administration in Florida State's College of Business. "However, when in excessively low or high ranges, both the company and the employee are likely to suffer."