Yeah that's what I had pointed out in a previous post. Its the only drug I know of that is consistently varied from person to person even with the same batch. Although I can say this - whenever we had groups that would get together and trip, we would all end up on the same trip. This was much more common with aMT than say, LSD or shrooms, where most of the time we would be too far out there to really communicate anyway.
What was the highest dose you took? I've noticed that there is somewhat of a dose-dependent response to it. Like for example, 30-40mg produces more MDXX-like experience for me, accompanied by a 'mission' that MUST be completed or I will flip out about it until the end of the trip (my 'mission' one time was to steal the stop sign from by the local high school - I ignored it but it drove me nuts all night). The higher doses, the drug still has very strong MDXX feelings (I actually prefer it to MDXX drugs - its a lot less synthetic feeling other than the body load) but turns into a full on psychedelic trip.
I only ever got colorful visuals from it one time orally (that was a group trip) - the rest of the time, it was more along the lines of things breathing, flowing, melting... I remember one time I stared at a picture of an ocean for an hour and watched as the waves crashed about in full 3D but that was still just visual distortion, however entertaining it was.
Anyway I think aMT is an odd one. Some people have a terrible time with it and some people think its the best thing ever. Some people don't really "trip" and just get euphoric effects, while others compare it with LSD.