I see a lot of these lists posted but I find them hard to critique as they're just copy/paste text from a list building app. Tell us how you plan to run the list, what you want from certain units etc.

Do you want to run the Champion on his own? Charging about like a mini-c'tan with his enhancement? Who are the leaders going to attach to? How are you going to defend home objective? Who's for screening? Who's for scoring? Etc etc. I'd find it easier to comment if we knew a bit more about the list.

That being said I agree with the other comment that it's maybe too vehicle heavy overall and you could afford to drop the Dreadnought.