I experimented yesterday with 10mg, due to my reactions to lower doses last time being a bit too weak.
I had a good bit of euphoria, certainly not on the level of amphetamines, but longer and more consistent than MDPV and better also unless I compare it to a very large dose of MDPV with redosing. I took it at 7am yesterday, and went to bed at 2am, and it only took about 10 minutes to fall asleep, which is a lot for me (I tend to turn my mind off so easily that I fall asleep as soon as I hit the pillow). Not a very refreshing sleep, but I got 5.5 hours of it, so i feel pretty good today, just a bit tired.
I find the euphoria with this one pretty decent and it has few side effects unless you dose too high. It does me tap my foot pretty much non-stop all day, although I do that to a lesser extent anyway because my metabolism is very high and I have loads of energy almost all the time.
I don't find this one particularly addictive. It looks like we have some different types of responses to this material. Some love it, some like it (such as me), and some dislike/hate it.
To further illustrate difference in substance effects, I personally also use kratom a lot, and I find it to mix very well with stimulants, or the majority of them (including this one). I also find that invariably, with any drug I've tried that has enagtive aftereffects/hangover, if I take kratom, especially shortly before bed, not only will I feel much better immediately, but I will never get nearly as bad a hangover. When I used to drink, I would get very, very drunk, and if I didn't take kratom after I was done drinking, I would feel wretched the next morning, but if I did, it would sober my mind up but make my body buzz awesome, and the next morning I would feel pretty good, not perfect, but much better.
YMMV