The Electric VTOL Airplane is a great compromise between flight time and usability. It operates as a plane in forward flight for good efficiency / range and can land and take off vertically by tilting its rotors or by using another set of propellers.
VTOL airplanes are good for certain classes of problems. Where they are most useful is in medium-range applications that do not require persistent hover capability. Such applications include precision agriculture for medium-sized farms (200 acres) or mapping large construction and mining sites.
VTOL airplanes fall short, however, when dealing with larger areas (200+ acres) and applications requiring persistent hovering. The extra flight time gained through efficient forward flight is offset to a certain extent by the weight of extra equipment needed for VTOL. They also cannot hover for extended periods of time, much shorter than traditional multirotors.
There are also some control and stability issues when transitioning to forward flight and when landing in windy conditions that are as of yet unresolved.