David they are well worth growing so if you can get them,give them a go.
You say that they need a 6-9 month maturity time and that's about the length of time i have mine growing but the tuber growth is triggered by light hours so its really only in the last month that they grow there tubers,up till then its all leaf growth.Here in the southern hemisphere the further south in New Zealand the better the yield because the daylight hours shorten quicker towards the end of the season,
I do find the longer you can keep them alive heading into winter the better.
No i haven't put any out in the sun yet,i should try it though
Here's a photo of each of the colours from the whole crop
