Less water during backwash? LOL, great marketing. I have seen a couple of failed lower plates which fills the house up with media. I have also seen a few dislodged distributor tubes, not a good thing. The vortech is also not available with the larger 32 mm manifold. The premise behind the vortech is great, and the lower shipping cost is nice since it does not use a gravel underbed. All that being said, a standard gravel underbed is just fine.
Save your money, go with a regular tank with a gravel underbedding.
For a regular house, I recommend no less than 1.5 Cu. ft. of GAC. A standard 10x54 tank will be just fine and it should cost the same as a smaller Vortech tank.