I've had my Helix floor for a couple of years now and it's amazing. For background, I was a guitarist for a church for years and I completely sold off my traditional head/cab/rack rig once I got it. Can't beat not having to pull around 200lbs of gear and still getting the same tone.
That said, I've moved states, I'm thinking about joining up with an touring group, and I honestly just want more gear. Problem is, I can't think of anything that the Helix doesn't already do well.
What pedals have you added to your pedal board on top of your Helix that was worth while? I go back and forth between adding a looper (because I don't like that I have to go down 2 menu levels to get to it live), or maybe a backup rig on the same board (amp in the box pedal, cab sim, some drives and effects), that I could also integrate into my Helix patches.