I have researched it pretty throroughly.
Here's a great site that does a good job debunking the fair tax. http://www.fair-tax.org/
So have I...I have read both books by the authors of the fair tax and the bill. The second one being written and published in rebuttal to the above website that you referenced.
-That site is a wash as it insults people which is never good for your arguement.(insulting IQs, etc.) Not only some of the points that it lists has is wrong.
-The Fair Tax does not try to get rid of the IRS. That is the biggest myth about the Fair Tax.
-The authors do note the outrageous spending of our government. That is a different subject to discuss as whatever the tax code is they(government) will spend it on something stupid.
-The Fair Tax is the most researched bill in the history of our country.
-The Fair Tax gets rid of the Payroll Tax(among others), which is one of the most idiotic taxes ever put into law.
-While it may not necessarily be the best ever, I believe the proposed system is currently the best alternative as to what we have right now.
-People shouldn't have to give up their wealth as they worked for it. The current tax code punishes production while the Fair Tax at least tries to tax consumption.