I watched the anime, but I've heard it's completely faithful to the manga. So I'd recommend looking up some of your favorite scenes, at least, to see if you like the way colors and voices add to them. :3 The English dub is great for all the main cast, including Grimmer. (His final scene is really pretty heartbreaking.)
Is his...is his left hand missing fingers? With one broken one? O_o Eeeep. Too much clipper torture.