Initial testing with the Stomp has been mostly positive.
The good: My Helix Native preset transferred onto the Stomp with ease and worked very well with just a little more tweaking. The build quality is quite high with good positive feedback on the footswitches and pots. Updating to the latest firmware and using HX Edit were both smooth and painless. Despite some reports I had read on Reddit, the headphone output works well, has sufficient gain to drive my IEMs, and is perfectly quiet from a noise perspective. Since I'm using a Sonic Research ST-300 Mini in front of the Stomp for a tuner I don't need footswitch 3 to function as tuner access. I was pleasantly surprised with how easy it was to change that footswitch to perform other functions, which in my case just means three effects are accessible in stomp model. I was also pleased to see how easy it is to customize the names and footswitch colors in HX Edit despite some older Reddit and Line 6 forum posts complaining about how hard it was. Evidently Line 6 heard those concerns and added the functionality, which is a great sign from the manufacturer. Surprisingly I got rid of the BOctave processing block from my original preset as I quite like my 3Leaf Octabvre Mini placed ahead of the Stomp. With three footswitches for effects I ended up with a pitch shifter for transposing down to either Eb-standard or BEAD (haven't decided which will work better for me), an overdrive, and a chorus, all of whicih will work in tandem with the analog octave-down and envelope filters that also live on my board.
The bad: Always remember to save your patch in HX Edit, otherwise changes that are showing up on the Stomp won't actually stick. I learned that the hard way when I stopped tweaking to go grab dinner, only to come back and realize that none of my changes had been saved.
The ugly: Adding an FX loop insert in HX Edit works well, but the actual results when putting my 3Leaf Audio Proton V4 in the loop are another story entirely. With the pedal in front of the Stomp it sounds like it always has, which is fat and funky. In the loop it's as if all the bottom end from the pedal just disappears. I tried adjusting the send and return levels as well as the mix, and nothing seemed to resolve the issue. I'm uncertain if it's the stereo send, which I would assume defaults to mono if a TS cable is inserted just like the main outputs, or if there's an impedance mismatch although I would suspect that would be a difference in level and high frequencies as opposed to bottom end. It's very odd. I wanted this pedal in a loop after the overdrive block as I prefer the sound of an envelope filter after any form of distortion as opposed to before it. It's possible there are some settings for the FX loop that I need to modify in order to get more predictable behavior. For now it's living in front of the Stomp despite the fact that it's in front of overdrive as a result.
The yet to be determined: My Pinstripe MISO arrives today and I have a gig tomorrow night. I'll report back on how well that combination works, but thus far all signs are pointing to this being a great setup.