I'm not interested in buying the new lunchbox plexi but I am curious to hear what it sounds like A/B'd against the 67 and 68.
There are videos comparing full size
Marshall plexis against the 20 watt Marshall plexi they came out with a few years ago, and predictably the SV20 sounds like a plexi in the highs but with the bottom dropped out, a higher low end resonant peak, all the typical stuff you'd expect from a lunchbox amp.
I bet this is similar, but the PPI master makes me wonder if lower volume settings would bring the big and small amps closer together.