The NRST, like the flat tax, is proportional. They are neither regressive nor progressive. They take a flat percentage of production/consumption.
Even though the NRST and flat tax are extremely similar, the flat tax is superior because it does not have as many negative transitional disadvantages.
The flat tax still requires that you report your income to the IRS which will still exist. The total rate will also be higher because none of the flat tax proposals include the FICA.
With the IRS still intact, how long do you think that the 'flat' tax will be 2 or 3 or 23 different rates again with all of the convoluted exemptions and deductions that are part of the current mess.
The FairTax eliminates all of that.
Please take some time to look at the advantages of the FairTax.
Estimates are that there exists a $1 Trillion underground, off the books economy. Only a VAT, NST or some derivative will get at that consumption and capture tax revenue due. A flat tax will not. If a VAT or NST were enacted, the deficit would be slashed (assuming 'rats and rinos are stopped from spending at the current rates)