A School voucher system is in no way equivalent to so-called school 'choice' because (1) rich families will have their private school costs defrayed (2) poor families will be unable to cover the balance of private school costs and so will stay in their public schools (3) money will be taken out of public schools, resulting in the complete destruction of the public school system and a second tract of wealthy schools without the accountability of public schools.
The School voucher system is problematic in that, by diverting public resources to private schools, already struggling public schools become further defended, thus making bad schools worse.
The School voucher system is problematic in that, by dismantling public education, private schools, which are 95% religious, are not subject to government oversight and can thus use taxpayer dollars to give children a religious education.
The School voucher system is a move against the romanticized ideal of universal public education which resonates with the cognoscenti who oppose vouchers while poor urban families just want the best education for their children who will need it to function in our high-tech and advanced society.
The School voucher system is beneficial in that it expands the private sector and makes schools first and foremost accountable to parents.
The School voucher system is problematic in that private schools, insofar as they can select or reject students based on any criteria they please, are poised to leave children with disabilities, inadequate test scores, or a lack of certain religious qualifications to languor in an increasingly de-funded public school system as those able to enter private schools effectively take that money away from the public schools.
The School voucher system is problematic in that, 95% of the time vouchers are used for religious schools, and thus, effectively amount to a roundabout way for religious adherents to defund the public school system and effectively replace it with a tax-payer supported school system in which Christian ideas such as intelligent design can be taught to children without government oversight.
The School voucher system is a good thing because it permits competition to develop among schools. The injection of competition would promote a healthy variety of schools to develop.