I love the Helix but one of my big disappointments with it is that the Ext Amp switching seems very limited. It doesn't work at all with my Blackstar HT5. I've had other pedal switching systems that had no problem changing channels on that amp, so I'm really hoping this is something that can be improved with firmware upgrades.
Now that the LT is out, I'd hope this particular function will jump up Line 6's To Do list, as I imagine a lot of LTs will get bought as traditional multi-FX systems, rather than as amp modellers.