Have you ever had homemade blackcurrant squash ("saft" in Swedish)? This is basically that. It's absolutely delicious, it's just not very different from just drinking non-alcoholic blackcurrant squash.
As a non-Swede and as someone who doesn't have access to fresh blackcurrants, I can't help but imagine that your comment rings true in my mind nonetheless. I just would have hoped for a version that would taste like the two combining together, rather than one bleeding into another.
If you fine strain, why are there blackberry seeds (in picture)? I received some blackberries from my CSA and need a tasty way to use them other than pie!