I don't get the MDMA comparison at all. I've tried 2C-B three times now, firstly at 20mg, subsequently at 25mg, and didn't notice any real, pronounced euphoria on any occasion. Giggly, yes. Stimulated, yes. Happy? Hard to tell. Euphoric? Certainly not.
For me, 2C-B is intensely visual but in a weird way. Contrary to information I've been given, I find the visuals (particularly at 25mg) far less controllable than those of other psychedelics. I find myself unable to escape the visuals, but they have a distinctive, managable quality about them - intense, intricate patterns overlayed over my entire field of vision, extreme high-speed breathing and melting, and a sort of visual energy (hard to describe) emitting from every object in the surrounding area. It's almost like viewing the world through rippling water, with someone shining coloured lights at everything.
As long as you're in a safe environment, I wouldn't recommend bothering with anything below 20mg. It's a relatively 'safe' psychedelic but at anything below that dose it seemed only a mild amusement for me. The depth comes at higher doses. 20mg produced effects totally different to my subsequent doses - instead of breathing, the visuals produced were sharp, distinct, angular and contrasted. Objects appeared to become more 2D and get outlines, as if drawings in a cartoon. I laughed a lot and talked about how silly everything was. It was almost like being stoned, but with energy and slight visuals.
25mg has a certain depth to it, but the problem I find with that dose is that I struggle to make any sense of it. It's too analytical, too much of a surge of thoughts and realisations, so that everything just gets tangled up and I come away from it feeling amazed but confused slightly unfulfilled. Letting your mind wander on 25mg is one hell of a headfuck. At least this produces an element of safety to the trip - it's almost too confusing to really dwell on any thoughts and emotions. You just have to let it happen.
Perhaps my favourite aspect of 2C-B is its auditary effects. It really is spectacular. For me, this tends to creep in towards the latter part of the peak. The vivid sensation of audio speeding up, slowing down, echoing and even reversing is something I'm yet to experience on any other psychoactive. My least favourite aspect is the final 2 hours of a standard, 6-hour trip, which for me tends to be purely visual even when my mind is back on planet Earth. Feeling totally sober, drained and exhausted, but while everything still breathes and contorts around you, is pretty annoying and distracting when you just, frankly, want to go to bed.
A rather ill-advised mix with large lines of ketamine last week provided for one of the most surreal experiences of my life - almost like a 5-hour long salvia trip in a way. Scary, massively confusing, and not something I'd like to repeat in a hurry, but one hell of an experience nevertheless.