I received a shipping notice before I got the DubT. It didn't just show up unexpectedly. IE was good about communication.
Mine is serial number 4
Here are my thoughts after a day of playing.
I have a SubT on my board. It is an amazing pedal and I was expecting the DubT to take its spot. That's probably not going to happen. They sound and react differently from each other. For now, I prefer the SubT, but keep in mind I've had it for years and have my perfect sound for it dialed in.
I'm finding that I have to adjust my playing style a bit for the DubT. It can glitch out, especially past the 12th fret on the g string. Rolling down the tone and playing near the neck helps a bit.
The SubT reacts very similarly to an OC-2 which is it's own adjustment, but one that is intuitive for me after many years of using analog octave pedals. Makes sense because I think the SubT is analog?
IMO the DubT behaves and sounds somewhere in between the SubT and the Source Audio C4.
Going through a filter like the XD does mask many of my tracking issues and makes a great synth sound. And the octave up option on the octosynth is nice. I'm still messing around with sounds, so my opinion may change.
I'm looking forward to reading other opinions when more of these are out in the wild!