Yes, you're right. Well I found it to be two-phase in that regard, with the pleasant body-high of the come up giving way to a toxic body feel after the peak. On the come-up, there is marked tactile sensorial enhancement, which feels feels quite pleasant (not nearly as nice as the DOC body high or that from 4-sub-MiPT). I probably went a little bit overboard in my description of it above, but still, it gives an idea that the physical sensations seem to be a major part of the experience, at least in the beginning phase.
After the peak, I found that this feeling turns to a less pleasant sensation in my body. This is distinct from the physical stimulation of 25C, which seems to be already quite intense on the way to the peak. This is what I meant by shitty and dirty. However, I also feel that my these sensations could be the recognition of bodily toxins or general disharmony in the body. I have since been more physically active and generally healthier, and I wouldn't mind giving it a go again to see if this is the case. It definitely deserves more exploration.