I heard the name of Ninja trader , not work with them . All had right to choose best broker what they think in terms of trading. I am not aware of their services. I am happy with my own broker who is best for me. I do not find good details about ninja traders so not ready to leave my own broker.
I am also hear about this platform, but also not yet using this platform, so far I am use metatrader 4 platform in my broker, so far still comfortable using this platform