For me 2C-B and K was unique. 2C-E and K was less so. It intensified the visuals and the confusion and the tripping by an enormous factor, which was kinda fun for 20 minutes at a time if I really wanted to push it.
The most intense trip of my life was taking 200mg of ketamine with 40mg of 2c-b-fly, while drunk. I just kept screaming for someone to kill me, kill me, barfing in terror, repeat FOREVER.
just kidding. Instead I saw my vision of how the world works and what it means to be alive. I'm totally not living up to it though.