I bought it. It works. It isn't too difficult to set up.
Since I bought my x55 stick I haven't used it at all.
Voiceattack with the HCS elite pack (the astra thing) is kinda nifty, but it feels like a novelty rather than a tool. I find I can respond FAR more quickly and efficiently with a good HOTAS stick configuration. Heck, i'm far far faster with mouse and keyboard.
I may eventually use it again. Mostly as a secondary to the stick config.. such as if I want to do multiple things while in a very involved dogfight. I can see it could be useful if you have an Oculus. Not seeing the keyboard can be a disadvantage in certain cases, it can make up for it. I am considering an Oculus when it is officially released in 2015, so will reconsider regular use of voiceattack.
Be aware though, it isn't perfect. 'request docking' with voice attack can be a finicky thing. It can and will cancel your accepted missions. Voiceattack is not intelligent. It just sends a series of commands/keyboard presses to the game queued by a voice command.
example:
Left screen is set to Navigation: issue docking command. Game moves to left pane, tabs to contacts tab, submits docking request. It works fine.
Left screen is set to Contacts: issue docking command. Game moves to left pane, tabs to missions tab, cancels the mission. It doesn't work fine.
So.. if you want request docking to work, make sure that your left pane is always set to navigation. Move it back to navigation when you exit and continue about your business.