I had finally got around to try this one. As my first trial, I dosed myself with only 18mg of 4-HO-MPT (after an allergy test) and was pleasantly surprised by its activity! :D
I dissolved the powder in an acidic drink for a quicker onset - it was pretty bitter and had a somewhat unpleasant taste, as most tryptamines are. It took about 15 minutes and I started getting dizzy and started getting the effects to kick in.
The dizziness continued for another 30 minutes and it could have been caused by wavy body feel - I could not connect with my body in a precise manner I usually do, so I lied down.
At first it felt very similar to 4-Aco-McPT - speedy, a bit disorienting and somewhat messy but interesting nevertheless.
The visuals came in strong and unexpected - as I was laying and looking at the curtains in my bedroom, I started seeing movements, as if there was a wind blowing in and causing the curtains to ripple. After about 5 minutes of watching them I realized there was absolutely no wind in the room and immediately they were blown in ripples again and my field of vision became somewhat unreal and hard to look at so I closed my eyes and was greeted by some expressive abstractions growing there - it was a very interesting theater of emotional melting pictures, I continued watching it for about half an hour.
The process had melted my ego slightly and I was able to see where my self-blocking mechanism was originating, all the way down to my early troubled childhood - it felt great to be able to work it out so easy!
After about an hour or so into the trip, I got up and felt euphoric and free, drank some juice and got into reading an interesting book. It was producing an interesting immersive effect, just like some BLers mentioned, it felt dreamy and sparkly.
In another hour I was down to baseline with a nice but very mellow afterglow. I felt pretty hungry and food tasted delicious! I went to sleep shortly after and had active dreams.
Conclusion:
I liked the short duration - being able to come down by the third hour is useful when trying to relief some work-related stress in between working days.
It reminded me of 4-Aco-DET as well, just like
cj187 mentioned, but 4-HO-MPT definitely has it's own place on the shelf. No similarities to LSD is noted either, but I can see how the speediness and the initial rush may be interpreted by some as such. Overall, I liked it and looking forward to trying it in higher dosages!
I am tempted to add some 4-HO-MPT during an acid trip and see if there is any synergy. 8)