Early Potato - Swift

They got a bit burnt by a very late frost here even though covered with fleece. I also planted some rocket. The rocket recovered and their yield is OK for me, about 1.2 to 1.8kg per plant now but the swift never made any more foliage and, digging up the first 4 plants there was just about 1.5kg between them, enough for 4 servings.

Has anyone else ever tried this variety with good results?

What I harvested was a decidedly better potato than rocket but it would have to do far better than that to be worth growing.