I don't see what advantage they have over other hot ends other than larger diameter nozzles. The example they show of the object with the quarter on top looks pretty rough, for most of my uses I would consider that unacceptable quality of finish. the smallest nozzle they show is .6 mm and no doubt it will spit out more material but the layer height will of course be more resulting in reduced quality. Any nozzle could be drilled out larger and as long as the required heat is there to continuously melt it would be the same deal. Just my opinion, maybe some one has tried it can attest to it's value.