There are (at least) two things about the Hydra that disappoint some people. One is that it still only works on Windows computers, and the other is that firmware etc. still limits its frequency.
Not my project, but take a look at https://github.com/rpavlik/razer-hydra-hid-protocol - someone has made some progress with figuring out the controller's USB protocol.
Will Sixense and/or Razer be faster to give us Linux and Mac support and 250Hz control?