Product endorsement is somewhat of a joke. Lincoln Brewster is one of the only artists that I have encountered that noted that Line 6 does not "give" him the equipment. He purchased the HD500 simply because he loved the way it sounds. I am guessing he will jump onto the Helix wagon too. I am hoping that Line 6 will provide at least some tutorials on how to link the second DSP. I have tried to create some patches on my own that use the second DSP path but with no real success. The Full Editor will be very helpful for "visual" folks like me. I loved the HD500 editor. The HD500 was pretty cryptic for deep setting changes.
Much of the interface for the Helix is pretty straight forward. As noted above, if you work for Line 6, you probably won't need the Full Editor. I am sure the foks at Microsoft and Apple don't use half of the easy user interfaces that the rest of us rely on ( i.e. keyboard shorts etc).
As for better or not than the Axe-FX or the Kemper, that is found in the ear of the beholder. Some folks liked the GT-8 and 10 and 100 better than the HD series. Some preferred the HD. It is all about how each individual "hears" the tones respectively. I love my Helix.