Indeed I have. Somewhat less potent according to the bioavailabilty floating around the internet.
I can't tell you an amount as potency varies and I've only ever done it a couple of times. The taste is quite bitter but not extremely bad, just a little unpleasant chemical taste.
30-40mins or so before you'll notice it, most likely.
Start on a low dose if you're doing it orally (1 gram is a lot to me), It should last a couple of hours longer if you take it orally as well. I know someone who scoops it straight out of the bag and into his mouth when out in town, 200mg a night is not unusual for him (fucking heaps imo), but you'll see him absolutely wrecked when the weekend ends.
(PS: Take my advice as my opinion only, I am not experienced with this drug at all.)