I just got my Helix yesterday after having had almost every modeller under the sun for the past 15 years except Vox stuff. I have had 2 Axe-Fx Ultras, 2 Axe-Fx IIs and 2 Kempers, POD HDs. I know ...
I got the Helix because of the form-factor and the fact that it was supposed to do USB audio that I need for using effects plugins hosted by Apples MainStage, something the Fractal AX8 cannot do without an external sound card, and the AX8 doesn't have a built in expression pedal.
Unfortunately, using it as a USB sound card produces a storm of digital noise. Hopefully you will fix this soon, Line 6. Otherwise the Helix is a fantastic platform that does everything I need and want, and I´m very thankful for you bringing it to the market.