The full scale voucher study required by Act 153 has been completed and made available to the public: 
HERE IS THE PDF FILE OF THE STUDY

Here is the requirement from Act 153:
"The commissioner of education shall request the Regional Education Laboratory Northeast and Islands (REL-NEI) to research, analyze and, on or before January 15, 2011, report to the senate and house committees on education, the senate committee on finance, and the house committee on ways and means regarding the fiscal impacts on the education fund, the general fund, property tax rates, and school budgets as well as the effects on educational outcomes if the state were to make tuition vouchers available to all Vermont students. The report shall include a summary of peer-reviewed research, with particular emphasis on research related to Vermont or other demographically or geographically similar states. Areas of inquiry shall include student achievement, property values, special education services, transportation, income levels served, community involvement, and social and economic stratification, if any."