Not to bad tbh unless theres a "run" day the c24 make quite a noise and when the jets are out buy ear plugs there loud but mad to watch them
Depends on where you live in Brassall. I live in Emerald Hill right next the the Warrego Hwy and regularly get planes at all times of the day and night. It's only a issue of you are a light sleeper or if you have little kid's your trying to put to sleep.
It's important to know that the air base has fighter jets they are significantly louder than commercial passenger jets and generally fly in all weather conditions.