Am not current on any type, although I operated 135s for several years. Having seen the effects of a thermal runaway on an aircraft battery, I shall be interested to see if this is a contender.
As for survivability, kudos to the designers. Looking at the rate of rotation after tail-boom separation, I very much doubt whether any pilot would be able to keep hands/feet on controls under those centripetal forces, so there goes the option for double-engine shutdown.