Yesterday out of curiosity I took just 2mg of 2c-e (orally) while I was waiting for a dvd to be finished 'burning' to take over to a friends house.
I just put it in some kool-aid and drank it and forgot about it. A couple hours later, we were watching a movie and it got my attention, felt a little body buzz, and then noticed my pupils were bigger, and colors were..quite vivid! No other 'visuals' except very nice color enhancement and a sharpness/clarity to everything. Oh, for a while, maybe an hour or two, I did see faint tracers. It was like a low dose of LSD, I was suprised just 2mg did this! The color enhancement seemed just as colorful as the higher doses of 2c-e i've taken. We took a short walk and it was quite nice for just some visual enhancement without really 'tripping'. I later went grocery shopping, nice colors hehe..
I've found that set/setting and being active/passive has a lot to do with how strong the trip is with this stuff. I wrote a trip report for 10mg 2c-e and i was at a strong +++ touching ++++. I was active as in, looking for changes in my vision, changes in thinking, etc. I was writing the trip report, describing the kind of patters I was seeing, which made what I was seeing more intense, etc.
A friend and I recently tried 16mg, but we spent a lot of the time watching this winamp 5 visual thing, much more 'passive', the computer was making some cool visuals already, and going to the music good, and we both later on walked around and the visuals weren't that impressive, I didnt see pictures pop out in 3d and come to life like they did on 13.5mg (another 'active' trip, i was not alone but i was the only one tripping, a definite +++) which I was suprised at (my friend seemed to be on the same level).
We were both saying "shit, we gotta take 18 or 20mg next time". I think 18mg would be great, but, instead of a computer generated visual to look at, just some plain text on the computer screen while its on, and maybe taking a walk, sitting outside, sitting inside talking, no TV or movie thats for sure - would be much better.
"A tiny bit disappointed with the effects" at 16mg one time, then, really suprised how good just 2mg was for sensory enhancement

Wierd %)