They work the same as any other 3D really. Sense of cockpit scale is great, it feels like you are in it, but still for me personally, I find 3D a "fun" diversion for an hour, but personally think it's relatively pointless all told.
There is zero chance I could play in 3D for long periods, not because I get any sickness, but it's just not as good personally than 2D.
BUT.......I am very interested in a Rift, OSVR HDK2 or Vive. This is where the immersion factor should really kick in. I am debating on purchasing a HMD this week, so we will see what happens.
The above just proves that Tridef3D along with Trinus/Vorpx etc, means that a specific game may not have to have native VR support to get it working with HMD/VR headsets.