Progress is a series of crawls, occasional leaps, and failures, some catastrophic. If this thing achieves a safety record on par with current commercial travel, I’d buy a ticket tomorrow. Since landings and takeoffs are the significant safety threats, if this idea can somehow slow down to land at current jet propelled aircraft speeds, it’ll possibly be safe. Landing at speeds of an F-104 Starfighter? Uh…probably not. As for high speed disasters, well, that possibility seems like a quick way of dying. Certainly beats agonizing in a nursing home somewhere!