Vantaggi
There are no Applicant Paid Fees, so that is the one saving grace. Otherwise, not many pros it is a standard "tape your hand to the phone" high pressure environment.
Svantaggi
Recruiters are used car salesmen, they run fake ads to bolster the talent pool (when no such job order exists), they are merely submitters....hoping and praying that 1 of the 75 people they submitted to the employer is liked and gets an interview. No one has the courage to tell the employer, look this guy/gal has it all, they are all just wimps afraid to upset an employer. They will promise you the moon, then never touch base to tell you that the employer didn't like you. Basically, they are all just quota driven snake oil used car hustlers...but that is true of most agency environments, so beware!