Some tips. The bung is in the wrong place so it always holds some water. The boat's stability kicks in provided the paddler is forward. The stern rail will catch in heavy water.
I've paddled the newer versions (7.6., 8.1, 8.6) and they have lifted the rear edge, fixed the bung and upgraded the fit-out. And reluctantly I have to say that they are an improvement. But I still have absolute admiration for the Mamba 8.0 - a classic river-runner.