I'm not normally a fan of dialect, but I tell you, Mark Twain has given a fine example of the right way to do it. He is consistent in the spellings of the different words he uses and shows different ways of speaking for each of the characters. That is, they don't all sound alike. So it feels authentic. I really like that aspect. The language that Twain uses for Huck Finn's voice is absolutely delicious. It's so rich and wonderful you can cut it with a knife. He keeps up the quality of his main character's voice throughout the entire novel, staying consistent and making the story so much more sweet than it would be otherwise. One thing I noticed is that though Huck's grammar leaves something to be desired, he actually has quite a good vocabulary.