I had a boerboel female pup for a few months recently. It wouldn't be correct to form an idea about the whole breed based on my personal experience with one dog. However I worked with a few different mastiff and LGD breeds and also seen others work them on video. I was able to draw conclusions that I was complete with without waiting for the pup to mature. I eventually decided that this dog is not for me and placed it in a great home. Following is some stuff I previously wrote about the boerboel that may be of interest. I'm leaving it in the same order as when I first posted it.
Here's what they look like BTW.