The Tech 21 Sansamp Character pedals, upon which these Joyo amp pedals are modeled (“borrowed” might be a polite word, since the enclosure size and controls are identical), are sonically superior.
I have the American, but not its Tech 21 reference (Blond), as a “just in case” curiosity. I do have the Tech 21 Liverpool and once A/B’d it against a Joyo ACtone: the Joyo was a serviceable approximation of an AC 30 while the Liverpool sounds amazingly close to the real deal. (I also have Tech 21’s British Character pedal, which sounds great but doesn’t nail the Marshall in a Box as well as the Liverpool’s Vox in a Box). I’ve gigged the Liverpool and it’s 2-channel variant, the Mop Top*, so I find the concept to be solid.
The American has a warmth—not exactly a “blanket over the speakers, more like a cardigan sweater—that I can’t dial out. It’s good enough, perhaps, but YMMV.
*If the Mop Top had a built-in tuner like the RK5 Fly Rig, I probably wouldn’t be using a Tone Master Pro for gigs…