Like The Gardener, I tried it once, using seed from Desiree pollinated from Kondor. Again, similarly to The Gardener, after sowing (under glass to lengthen the season), I got one marble sized tuber. The second year this produced three slightly larger tubers. I reckoned it would take me at least another 2 years to get a meal out of them so I gave up and we ate them - they were exactly like Desiree.
Having said which, of course, seed is the way all new varieties are produced, but, as with all hybridising, it takes years of patience and throwing away the strugs before you come up with anything worth persevering with.