I've a guitar buddy with a Two-Rock; beautiful amp, it even has a gain stage worthy of its pedigree. I'm familiar with Ceriatone, the others have escaped my review. I've owned a VHT Pitbull and still have the Classic (both Fryette designed). My experience with VHT is a positive one but dates before the company was sold.
There are many Dumble designs on the interwebs. Some, I've been told are quite good. The secret is not that secret. IF the company (VHT) has maintained the previous owner's integrity, I'd assume they have something there.
Your mission, should you decide to accept, is to let us know how well behaved the little beast is.