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Huh? Archers? And why? It seems to me that the money spent on transforming archers from red to yellow won't be recouped by that rather dubious ability. Statistically, they aren't any better either. Besides, there's only one bow, but many castles and other heroes. So, you want to transfer troops or leave them to defend... and what? Spend lava again to upgrade them? Or just walk around with two different stacks of archers...?
As for champions... healing is definitely not overpowered. How will healing help you when several paladins are wiped out with a single hit? If they had hundreds of hit points, then healing would be a great thing... but as it is... it's only useful for removing hypnosis/mirror image.
Otherwise... I agree. Except for griffons, I take them depending on my mood; I like both.