It depends. If they ask you to pay the type-rating: forget it! Otherwise it might be a nice way to start your career, depending on the roster and general treatment of employees at your potential employer. The requirements of airlines change with the market: when there are lots of qualified pilots and few jobs, they will rather not pick guys from GA-jobs. But in the current climate airlines are again falling short to recruit qualified pilots. If you want to wait for the airlines, do it. But do not wait too long, the window of opportunity may not be open for too long anymore.