Not to ruin the ride.. (Score 2, Insightful)

.. but four and a half g's in deceleration, even shortly, would run the risk of a red out for those not inclined to physical fitness. The number of people who would buy into this would be further limited by the idle rich who realize their bodies may not agree with the effects of gravity. As far as tourism goes, having to wear a high g-force suit just to get a good look out the window without risking your health seems like an overlooked detail.