I did a comparison test a couple of days ago between V4L and G6 and posted it in the thread called "G6 Compatibility". At the moment it's one thread up from this one.
I did get the blanks too, as well as Tribeca carts. The blanks work great, IMO. They stay cooler, they are quieter (air noise) and I like the cool, recessed mouthpiece cap. I filled a blank with CoolMist and it took many drops (I didn't count but it had to be at least 16), it's been going for a couple of days now, no let off in flavor.