Pros
Salaries are paid on time most of the time, seems to be the only benefit.
Kontras
It's requires a lot of efforts and time to compile the cons of this organizations. In our case we are working for an organization and TASC is only acting as an outsourcing party managing our payrolls and visas. We have very little to deal with TASC but in this very little interaction often proves to be nightmare which is not limited to forgetting or delaying visa renewals of employees, no performance reviews or increments in years despite having mentioned in the appointment letters, lowest possible blue collar category insurance given to engineers which is often less than 0.5 percent of their salaries. Basically the role TASC plays is only paying you the amount paid by the de facto employer, after deducting their commission, hence they play the role of a commission agent who try to avoid paying any committed benefits using all unethical or even illegal means possible unless the employee catches them. Employees are charged for their employment process and even in some cases the employer charges additional commission for doing visa process in addition to the immigration charges and fees.