1g of JWH-081 (yes, not a typo, 081 not 018 ) arrived today. I first smoked a tiny amount, that looked like the size of maybe a grain of salt, barely visible - as an allergy test. I smoked that, felt threshold effects, felt similar to a small hit of resin - leaving me feeling it but nowhere near enough. Then about an hour ago I smoked say 6 or 7mg, I came up very fast and very hard, felt like I was rushing on a strong stimulant for the first 5 minutes - probably because that was a lot since I haven't smoked in 6 months, after those first 5 minutes it settled into a strong high. I can't seem to classify it to a Sativa or Indica high, because just when I think it feels like one, it takes on the characteristics of the other. It feels really upbeat and euphoric like a nice Sativa, but I've also got a nice body high and the tiredness of an Indica, so I'm very happy with that, as it seems to be the best of both worlds. I'd say it isn't as strong by weight as the other JWHs, because with no tolerance I'd expect a bit more from 6-7mg, but my experience with -073 was a herbal blend so I can't be sure, and I haven't tried the other JWHs.
Anyway, overall, really enjoying it, glad I bought it, really nice to be high again, just chilling with some reggae and food. One thing I'm a little worried about is the duration, because the first 10 minutes had the most intense euphoria, I'm not sure how long it'll last in total, with weed I have a 1-2 hour peak and then 2-4 hours of a levelled out high after that (Yeah weed lasts particularly long for me), JWH-073 was similar, a little shorter but not a lot. I'll report back on the actual duration of this tomorrow.
Edit: PS, forgot to mention. I didn't use the most efficient smoking technique. I dumped a tiny pile of powder on a bit of rolling paper, put it in my pipe, I then heated it up for a few seconds so some of the JWH could absorb into the paper, then smoked the paper, there wasn't much taste to it, definitely felt like I was smoking a liquid rather than a powder, quite hot on the throat and lungs, but hit me hard and quick.
Edit2: Trip report:
http://www.bluelight.ru/vb/showthread.php?t=524259