I've taken this twice so far and it's sort of hard to describe. 1mg was better than 500mcg for me.
The compound felt distinctly phenethylamine, lots of body buzz--would likely be amazing for sex. Music appreciation was off the charts good. Visuals were minimal for me both times and consisted mainly of color bleeding, weird effects with light. No patterns or overlays. On the lower dose I was more energetic and could have danced or walked around a museum all day. The higher dose found me feeling languid yet stimulated.
The come-on is very fast for me, about 15 minutes until first alert then a rapid rise and a drop-off after 3 hours or so. I felt initial nausea both times, tendency towards bruxism. The residual stimulation and feeling of being off-baseline continues for a long time for me, I find it hard to go to sleep even 10 hours after ingestion. The second time I took this, at 1mg, I decided to take a dose of 4-aco after 3 hours because I felt the trippiness waning. Combination was fun but nothing special really. 2ce+4aco together is much more shattering. The 4aco here just amped up the visuals.
Overall, there was nothing too ego-threatening so far for me in this one. The day after taking 25I I feel really crabby and short-tempered which is a minus in my book. I'd likely keep this one around though.