I've been getting these for a few weeks now. Can't remember the first time I had them, but very, very nice.
I'd definitely recommend half - funny story. Was in a hotel room in the city last night, banging down a few cheeky lines, and a guy who hates snorting anything, decided he'd take a half (on my recommendation). Unfortunately, he was half pissed. We went down for a swim and a spa, and he was falling all over the place. Absolute mess.
That said, I don't personally think that these are the absolute bomb. They're good, but if you're regular, you'll still neck 2-3-4 of these without any issues. I had some great ones earlier in the year, unfortunately I bought them when I was out, and didn't see what they were - stronger than these though.
Don't expect the orange butterfly supply to dry up soon either - Melbourne is flooded with the fuckers.