I think where the extra juice is with the Two Notes Opus/C.A.B. M+ is, the system integration relative to the actual amplifier being used by a player (mostly guitar player).
The Bluetooth control features are great, but I tend to set and forget to a large degree in regards to making major changes. (i.e. not messing with the amp once set.)
Streaming tracks (and recording tracks) with a cell would be cool. But, the performance of the OPUS as an IR loader is unsurpassed @ $269 on sale now.
QC modeler is what it is and does, for like +/- $1600, an option desired by some. The Boss product - Katana (Bass amp?) is an amp with Roland legacy. Perhaps not on a level that many professional guitarists would be looking to integrate with something like the recently released Loader II platform?
I see Two Notes product line as an - "non cost prohibitive" professional stage system that also records in a truly exceptional manner. The other stuff is convenient, but not a deal breaker in any scenario.
I'm nearly finished with my board transformation and will follow-up with the pics as promised.