Chris Farris shares his experience with Art Laffer, father of the GlennTax, while at the Americans for Prosperity conference:

Dr. Laffer faced a fairly skeptical crowd over this plan. The general consensus among the group was that centralizing revenue collection at the state level and trusting the General Assembly to send it back to the municipalities is a bad idea. I agree with that. However I’m also a pro-growth capitalist and wanted to see if there was any economic data that might support the GREAT plan as a pro-growth measure.

Dr. Laffer made a case that elimination of the property tax would benefit the Georgia economy. It would help the housing market recover by making Georgia properties more economical vis-a-vis the rest of the nation. He also made the case for the revenue neutrality of the GlennTax.
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The thing that sold me against the GlennTax however, is the fact that Dr. Laffer believes that both the GlennTax and an elimination of the income tax would produce the same economic growth benefit. If that is the case, why strip the local municipalities of their ability to raise revenues to the degree they see fit. If Nancy Pelosi proposed we get rid of all state taxes and have the US House of Representatives decide how much of that revenue the state of Georgia got we would be up in arms.