Hi Rootwhacker, the Sapphires are my absolute favorite carto I've tried so far and what I use all the time right now. They have a small wick at the battery end and that is where the atty is also so the vapor is nice and cool by the time it gets to you, which I personally prefer. I always fill mine with a syringe because it's so easy that way, and I like that you don't have to use a paperclip or other odd object to pry them open. Just pull off the mouthpiece and remove the rubber stopper. I haven't tried filling direct from the bottle, but I think the 1 ounce size is probably too big to fill direct. I'll give it a whirl later and report back. One of the main reasons I like them is that they have never leaked on me yet (knock on wood!) and I never get the burnt taste which is a huge pet peeve for me with some cartos. After you fill them, you want to give them a couple minutes to make sure the wick is nice and soaked, but once it is, it's good for life unless you run them completely dry (but since they're clear it's easy to prevent this). They hold 1 to 1.5 mLs of
juice, which I like as I don't like a carto that's too big or clunky (too un-girly for my pink KGO!). I fill up a few of these in the morning with different flavors and I'm good for the day. Best of all though is the flavor. I tried a bunch of different cartos and picked these primarily for that reason. I just think my flavors really shine
through these babies! But now I have to try out these Vision Extremes you and Tendril are talking about!