So, I shucked one of my little Vietnamese x Columbian x Afghani seed plants. #3 to be exact. I was quite please that the seeds were mostly done, and they fell out of the colas with little effort. Out of 300-500 seeds, many are still greenish, but about 50%-60% are finished brown with darker tiger stripes and/or spotting. The lighting in the picture makes them look a little lighter than they are, but if you look closely at the striped ones, they look like many commercial seeds, although not as dark as some. From my ghetto experience, I would say that practically all of these seeds are viable.
#3 was the female that grew a bit wonky out of the seed. After a few weeks, she caught up to her sister, #1. Both girls were well-structured, wide-branched, and stacked up the colas quite well. There were practically no unfertilized calyaxs left on #3, they all had seeds. The plant gave off a distinctive Columbian aroma, very similar to a Sannie Columbian x Lambsbread I grew. Of course, I smoked the spent plant matter, and it is exquisite. It gave me a sativa rush with an indica bottom. Short-lasting, as expected with no swoll buds. If grown as sensi, the effects will probably be similar, but stronger and balanced differently.
It would be interesting to see how some of these grow out, in the hands of some better growers...