I too am always kinda mystified by the "Dumble sound", which no one can quite describe. As his amps were ALL custom made for the customer, I'm not sure there really is a "dumble sound". It's more like a "dumble architecture", and usually I hear a lot of somewhat esoteric terms floated around any time someone brings them up. "transparent", "touch sensitive", "nuanced", and so forth. I've never played through a dumble, nor have I ever gotten a chance to play through a Fuchs, Two Rock, Amplified Nation, or any of the other D-type amps. Also even though I'm from New Jersey, I've never tried a trainwreck amp either, though there seem to be a good number of amps that are designed like those, including a bunch from Dr. Z.
Most of the demos I have heard of the Enigmatic 82 sound very good, though many of them are well above my usual desired "tech level" I want to be at when playing guitar. I'm not the type that will sit there and tweak a ton of settings inside of an interface to get the most nuanced sound possible. UA's gear is great, but for someone who is kind of an analog purist, I'd rather have something like an Ethos overdrive, though those are definitely quite a bit more pricey than the UA.