But FSXAIbureau just gives you the ability to replace FSX basic AI models by much detailed and native FSX - models. After that, it's just about changing some files in Simobjects\Airplanes\ if i am not wrong. These AI models are specially interesting if you don't usually fly on networks or want to fly times to times on your own.
Now, it's up to Erez Werber the founder of FSXAIBureau to tell us if we are wrong or bring you all the explanations and advantages. Several models of B-737 are available already.