I'll never have the coin to own a Dumble, and truly the "Dumble sound" is sort of a misnomer as He built each one specifically for the artist.
Robben Ford ( lifetime fan) has the #1 and he's played others that he didn't like.
The pedal allows for an enormous amount of tweaking, I have a a full PA setup, (retired soundman) as well as 9 amps to play with . While it has a great OD sound, I set it more towards the "Robben" tone .. Clean , Rich and very touch sensitive. It makes all the other pedals on my board sound more Hi-Fi , similar to when I plug in my Alembics.