Ahh, the old argument whether a single is safer than a twin.
Give me two engines any day. Even if not the most reliable, the chances of both snuffing it on the one flight (assuming good fuel and enough of it) are remote.
Even if single engine performance results in a slight descent, I like the idea of one remaining power-plant prolonging flight for longer than is the case when a single has a failure. With a legal full load, the old 150 and 160 hp Apaches did not stay aloft very convincingly on one engine, but for all that did not have too bad a safety record.
Pilots will surely kill themselves in this thing, but Charles Darwin would probably have his way with these people eventually anyway.