Have a look at the excellent and fascinating
post from Milt, a very experienced Australian TP, who writes about his experience flying gyros in the 60's.
His final paragraph on the subject:
Gyro-copters continue to be built by small bands of enthusiasts. Airworthiness authorities continue to grapple with safety aspects and have little effect on a steady string of crashes, more often than not, having fatal consequences for the would be aviator.