Those are called Kamchatkas around here and they are one of the earliest fruit in the garden. Tasting just like wildforest blueberries but ripening in late May to early June. The kids love them!
The main problem we have with that bush it's that it grows very slowly and during a very narrow window in the growing season. Once the really hot weather in June starts, the bush stops growing.
We have had 2 honeyberry bushes for the last 3 years. They came in a container and they will not taller than 20 cm. The first year they didn't grow at all or maybe just a few centimetres. The second year they grew maybe 20 cm and gave a couple of fruit. Last year they grew another 20 centimetres and gave us a handful of fruit. This year we gathered about 3 handful of fruit and the growth is consistent.
In the meantime we have started rooting life branches of the plant by burying them under a pile of soil. This way we managed to get two new plans last autumn. This year husband is piled soil on four more branches. In the long run we hope to have at least five different varieties and at least 20 producing bushes.