I'm a Demavend full charge player. The deck is extremly fun if it gets going, but extremly frustrating against heavy control, as more units will get killed immediantly than life at least 1 turn long. But if it isn't interrupted it generate insane value. There is nothing better than Dandelion into Vysgota for generating +4 every turn if kept unanswered. Or a Bloody Baron into Ban Aard Tutor as a finisher for a 30 point swing.
The biggest problem that I see with that deck except enemies removing everything, is that half the deck consists of cards not working on charges, because they either support the archetype or are necessary as general counter cards. Thus, you easily loose a lot of value from Demavend, because there are no targets.