Carrot Gonsenheimer Treib

In general carrots do badly on our very heavy clay, so beyond the odd hopeful row of early Nantes I don't bother. But I recieved a free packet of gonsenheimer treib in a seed order so sowed a row. 
Wow - almost a whole row germinated and in 91 days matured into harvestable roots: I usually get 10% ish!!
The RHS is very dismissive, describing them as "wild" with fruit that is "small hairy and lumpy"! For that reason I only sowed a row. In fact thay have nice smooth conical bright orange roots. The taste test comes tonight.
Of course just before I noticed them I'd filled the remaining space in the root bed with spare kale plants!!
The point of the post? Anyone grown them before? And don't give up on stuff you can't grow because you might find a variety you can