Done a bit of poking and it seems the Turnigy Trackstar 150A is actually a Castle Creations Mamba Clone of some kind. Many car hobbiests are angry that someone can get away with it (But can buy a fake anything in china, the word copyright doesn't seem to translate very well) and those who have used the Turnigy haven't had great reliability from them. That said given the price difference you could burn 3 Trackstars tone Mamba so... yeah... economies of scale.