The trefoil leaves are really attractive and can be mixed in with salad leaves for a different taste. It's pretty enough to use as a ground cover plant so I think that it has a place in the border as well as the allotment. I think that companion planting with oca being used to smother weed growth is really worth investigating.
My tubers were always big enough to be worthwhile, but small enough to be a bit too fiddly.
They taste OK, I grew them for a few years, and it's good to be able to harvest a tuber so late in the season.
Personally I'd like to see a variety developed that's a bit more suitable for the UK's light/dark/daylength/climate.
Will be very keen to read all of your views on oca once you've harvested and eaten the crop in about 5 months' time.