Damn this couldn't have happened to a better bloke! Let's try have some patience, which I know is hard when you have a pending order you're looking forward to (me included). @Norvex is a legend and I'm confident he is working hard to get this sorted. He's a fav vendor of many of us for good reason!
I've used it at 500mcg and 1,000mcg throughout the past year. For me I notice that my endurance does increase when I use it for cardio, when I use it during workouts I find that the time my heart rate takes to drop between sets is decreased.