The RoyalSmokes XL ceramic cartomizers arrived in the mail today and 90mls of my favorite juice. The five pack came with the fill tip, so if you have a syringe, your golden. Wordupecig says they hold 1.9mls so I put in 1.6mls just to be on the safe side. You can see the coil with the wicking fed through the center. As I was filling the juice reached the top of the wick within seconds. Filling was straight forward. I used my Joker AV and turned it down to 3.75Volts. The draw is very light and warm in your throat. The casing does not heat up, actually stays very cool. The vapor production is immense. Frequent, repeated draws produce consistent flavor and vapor. Also tried it on an eGo battery with the same results.
Remember this is just a first impression, I've only been vaping on it for an hour now. So I have no idea how long they will last and produce good results. The instructions say you should only refill 4x.
What appealed to me was, no filler material. Just a wick and reservoir with free floating fluid.
One negative is that there is no visual way to see if your running dry.
Just overfilled it adding more juice, left the syringe in place and withdrew the excess. It will leak out of the bottom if overfilled. Wipe off and vape.
Hope this helps.