Like Axona, Mira is extremely blight and virus resistant - probably the most resistant variety known at the moment. They are both on the floury side of general purpose and effort is needed to stop the tubers becoming too big and starchy -  cut the foliage off in say August to get good general purpose tubers. These varieties are not really late maincrops - they grow continuously all season unlike classic late maincrops which are day length sensitive and don't bulk up until late summer. They require a different mind set - instead of working hard to get the most from them, as with other varieties, it is necessary to monitor them and stop them at the point when the tubers are right for you. Both varieties have some slug resistance (but long growing period can mask this) and both store very well. Mira is drought tolerant. Peasant survival food!