Not sure if tjontheroad is on this forum however he just posted his impressions from using Helix at a Pedal expo.
"The first thing I asked to do was to shut off all the FX and listen to the amp models by themselves. Every amp had great feel, wide dynamic response, and clearly a pro level representation of the real thing. The Helix ain't no POD I ever heard. Then, when you get the FX back in the mix, Helix sounds pretty amazing."
Now take that with the grain of salt that you probably will, but at least you now have a first hand account that they aren't hiding anything :D