Hey r/conservative, what do you guys think about the FairTax?

I'm just curious as to what you guys think about HR25 (aka- the FairTax).

I've posted quite a bit on the FairTax and the biggest criticisms it gets seems to come from liberals/progressives who think it's regressive (even though it's not), and libertarian/anarchist who don't want any federal taxation whatsoever. So, what do you conservatives think? Do you like the idea? What are your concerns/criticism, if you have any? If you really like the idea, could you see yourself voting for Libertarian candidate Gary Johnson (the only presidential candidate who plans on pushing for the legislation to pass)?