The phrase that hit me was "The Way It's Meant To Be Played". I had been runnning ED on my 4K monitor, and yeah that's lush. But you just don't get the sense of *scale* of an enormous rotating mountain of metal from the flat display. Leaning forwards and craning my head around to get in the whole expanse of a space-station is a *trip!*
That, and suddenly I'm much, MUCH nastier in a dogfight - being able to look around, and keep eyeballs on a target during FA-off combat turns is such an enormous tactical multiplier, both offensively and defensively. Massive combat performance boost.
Seeing a bit of my forearm through the tiny gap in the Rift near my nose... and seeing my spacesuit-clad forearm continue from exactly there, to the joystick that moves with my wrist's motions. Proprioceptive head-rush.
And be it a free Sidey, a Transit Van or a sleek, sexy Cobra, you're sat in a Spaceship. IN SPACE. That, right there, was worth the price of admission. If the Rift CV1 comes out next summer, I'll definitely have had $350 of fun from the DK2. I'm using a fairly beefy Titan Black, so performance hasn't been an issue. As to reading text, leaning in a bit works fine.