Got some earlier this week and gave it a few trials. The effects are cosmetically similar to MDPV, in that it has a distinct DRI feel. However, the duration is shorter (around 1-1.5 hours), and the euphoria is somewhat less prominent. Has a definite mood lift, but with a shorter duration than PV, and with a somewhat stronger comedown IMO (it made me signifigantly more irritable than comedowns from most other stims, during which I become more apathetic).
I dosed anywhere from 5-12 mg insufflated, which lasted anywhere from 30-75 minutes. Also, I tried oral doses of 8-20 mg, which lasted from 45-90 min. However I should mention that doses in excess of 15mg caused rather painful stomach cramps (though this was taken with ~1.5 mL GBL, so I'm not sure how much of it was the Pentedrone). Oral doing seems to be the most effective in terms of duration and euphoria, but is also the most likely to cause side effects (most prominently brief headaches and light cardio-tension). I have yet to try plugging it, but will report back when I do. Tolerance seems to rise relatively quickly (I ended up using ~1/3 of a gram in about three days) and insufflated dosing can become remarkably wasteful if used on consecutive days. This stuff is definitely moreish, but not nearly to the same degree as MDPV, which is a blessing. I would say that it is to PV what high doses of Buphedrone are to amphetamines (but qualitatively more similar).
Also, I have not noticed ANY paranoia/delusions/psychosis, which is a huge relief. However, my friend who shared in my nightmarish experiences w/ PV did experience some mild paranoia and tenseness, so YMMV. I can definitely see this drug being popular with those who have enjoyed (or cannot find a source for) MDPV. On a final note, this stuff numbed up my lips and nostrils comparably to cocaine, which I found really bizarre. If anyone else has this effect, I would like to hear about it.