Keep us posted on your experience. The thought of these is intriguing but leaking is a bad issue to me! Didn't someone say earlier in this thread that they are really leaky?
I carry my PV in my pocket and a wet spot growing in my pants is not good for business or social life!!
Mine hasn't leaked, and today I added almost a ml. Earlier I said I put a plug in the battery hole, but this time I just used the cartomizer's very own plug. The centerpost was only moist after top-up, so I easily cleaned it with a Q-tip and it's vaping great again.
These things don't pop either, they're quiet and consistent, and no juice in your mouth.
But no leaks! If you or someone does get a leak, try not using more than 2ml, and also use the plugs that came with it when not in use. The eGo carrying case is great, and has plenty of room.