I took ~1.6mg of 25C on Saturday and definitely noticed my body overheating. At first I attributed it to hooping (which my friend and I did for the duration of the trip), but when I took a break and sat down, I was still sweating a little. I frequently felt the need to step outside to cool down. It was about 55 degrees out at night, but it felt really good to stand outside with no jacket on.
The overheating seemed to subside after peaking. It worried me a little bit, but I made sure to keep hydrated. This was my first time taking NBOMes (besides a little bit of 25B last month) in about a year and a half. Probably won't take any for a while again. Even if the side effects weren't there, the trip was a little, well, boring.