I have 2 black experiences on my account and not too long ago had a gold experience which I wrote about in Frequent Business Traveler.

Tea Tasting at the Hotel Vier Jahreszeiten Kempinski - A GHA Local Experience


The VJ doesn't have a black experience available (or didn't on the days I was there, I don't recall) but I really enjoyed the afternoon and learnt a lot too. The picture below from the article should give you an idea of how it went.