I've got a female brongersmai, and boy is she one of the favorites in my collection.
My limited experience (as I only have one) with temperament is that they are pretty typical as most python species go. When I first got her, she was feisty and came at my face any I got close. Fast forward 6 months later after she'd done some growing and I'd put in a lot of effort to have positive handling sessions using a snake hook, she's calmed down perfectly. She's every bit as calm to handle now as you could ask for.
I got mine from Rich Crowley @ richcrowleyreptiles.com