I recently just watched the first 3 episodes of the English dub, and I love what I've seen of it, so far. Its the type of series that moves at a very slow pace, but makes up for it with very interesting characters, and cleverly written dialogue, with the experience also being enhanced by a great atmosphere. In all honesty, I'm not really crazy about the art style, but at the same time, its nothing that really bothers me, so it doesn't hinder the overall enjoyment that I've been getting out of this series, so far. I haven't watched the sub, so I have nothing to compare the dub to, but the voice acting in it seems to be pretty well done, for the most part, IMO.
Anyways, I can't wait to watch more of this series, when I get the chance to.