Not exactly new but first time it's done anything at all when I've tried it so new to me... sampled some bk-2C-B t'other day. Tried it several times previously (first batch) and did literally nothing beyond burn like fuck via any RoA beside bombing. This time it worked (bombed - fuck risking any more delicate surfaces again 8(). Surprisingly "trippy" - in many ways "deeper" than 2C-B itself. Had an overall good trip from it and it lasts ages.
However, there is a major issue. I have never known any substance generate quite such severe GI distress. Makes aMT look gentle on the gut. Without getting too graphic about it, I was very, very glad to be at home alone and within 10yds of the bathroom. All. Fukkin. Day.
Trip was fine - surprisingly interesting actually - but nowhere near worth it for the utterly ridiculous level of gutrot involved.