I dunno about the THR30, but my Dark Terror is hands down the best tone I've ever had... and that includes comparing it to a Bogner Fish with VHT 2150.

I agree with the dark terror. I AB'd it against everything from Mesa/Bogner and Friedman and that thing slays. It kills enough that I have a thunderverb on the way which is the same as the dark terror gain channel but it only has 3 gain stages. If I don't like it I am getting a dual dark. It is the metal tone I always had in my head. Such a good amp. It cleans up fine enough too.