Agree. This is my third day with these and I also ordered black because I was tired of waiting for the clear.
They came with a little tip thingy that I promptly bent while removing the rubber mouthpiece-cap thingy.
The standard GV blunt tip won't slide into the fill hole, but I just put the blunt tip on the outer edge of the cup and start rotating around the edge until I feel the tip catch, then I press down a little and squeeze until I see juice coming up. It kind of looks like the inside of a sinking boat. Once full, I release the bottle which expands and starts sucking in air. I use the suction on the bottle to remove any excess juice in the fluxomizer.
What's even cooler is that the blunt tip is excellent for dislodging the silicone ring. I will place the tip inside the ring and pry up, just a little, and the ring is on the tip. Point the tip up and the ring falls to the base of the tip. Push the ring down, just a little, and it stays put while filling. Once full and the excess juice is removed, dislodge the ring and it will slide down to the fluxomizer. Remove the tip, press down on the ring to make it flush with the top of the carto, then install mouthpiece.
This is the first time I could refill while, say, walking, or sitting in a car, or wherever.
I can top off a carto without ever having to lay anything out, not setting anything down, and only getting trace amounts of juice on my hands.