Very cool, Drew. Did you get your first one already this year??? I'd be surprised if that is the case up where you are since I just picked mine today, but who knows. I'm glad you liked them too. There wasn't really too much difference in the taste of the two I tried, but some difference. Surprisingly, though, I thought the indigo was the sweeter of the two. However, you may well be correct in saying aurora is the sweeter of the two because the difference I experienced could well be explained by Indigo just being more ripe.
I had read what you said about leaving them on well after they turned blue, and I did leave them a bit, but undoubtedly not as long as I should have and certainly not to the point where they fall off when you shake the tree. Why? You can guess....I was scared to death the birds would steal them! I only have a grand total of about 10 honey berries this year. haha I wasn't going to set up some big bird protection for 10 berries but also didn't want to loose the few I had before tasting them, so I'm sure I jumped the gun a little. But in short, I do think all the hype about honey berries and how they are going to be the next big berry may very well be true. I really liked them a lot. And while I personally would prefer them to be sweeter, I bet they would make incredibly good jams, jellies, pies, and other deserts. kind of in the way sour cherries are great in pies or jams but sweet cherries would be a little bland - even though they are better to eat fresh.
Well, keep us posted if you continue to pursue all these Russian, Canadian, Polish, and other sourced plants you've mentioned. I'll let you track them all down (if you find an importer/domestic grower) and tell me which ones are best. I also wish mine were bigger so those in the photos above look promising.