Boudain is a great sausage. It is a Cajun recipe sausage, with a large ingredient being rice. Because of that, it cooks up soft and doesn't lend itself to smoking or grilling since it splits.
In other recipes it is outstanding.
If you fry it up by itself, the casing will break and the contents come out and fry up with the remainder. It's great in scrambled eggs; as an ingredient in gumbo's and jambalaya's and recipes where the Boudain can open up and participate in the whole dish, it is a key ingredient.
Retail Boudain has as many ingredients and recipes as you can find. Each maker has their own style, all good. Find one you like and there ya go!