/\ Yeah, I found when I'd dropped the other half, during the time the two doses crossed over there was a more MDMA-rushy, soft focus vision, fluffy feeling going on. Then the first half would wear off and it'd be back to simple chattiness without any real body feelings, so it would be interesting to feel the intensity of a whole dose.
I definately don't think I'd double drop them though, as when it was at it's strongest I did get some wierd palpitation, heart skipping a beat feelings. After the various shit I've done to myself this isn't unheard of, so it doesn't really freak me out, but it's not something I like to encourage!
(that said, double dropping would probably be fine for others who don't weigh 7-stone-not-much or possess slightly spazzy hearts, as my friend took a fair amount more than me and was fine)