Carts vs. Cartomizers... eh, it really all depends, for me. Let me explain... If I have to do something that requires my undivided attention, ie: driving, I use cartomizers. I also tend to use them while I'm at work, it makes it really easy to sneak off to the bathroom for a quick puff or 12. Cartomizers hold FAR more juice than cartridges, unless you get large capacity cartridges.
If I am am home, sitting down reading or watching a movie, I tend to drip a lot. For me, dripping keeps the flavor fresh and each puff more robust. I can even mix different liquids, while dripping, to test out which flavors work well together. For example, right now I've been combining a gourmet vanilla with a cappucino and adding a few drops of a 24mg camel on top, for good measure. It's amazing what kinds of flavors you can come up with.
Now, if your manual says charge a full 8 hrs. then I would recommend doing it. Reason being is this, if you have to call, email or any other form of communication, with your supplier, the first question they will ask is "did you follow the directions?" In my experience being able to say yes, and THEN explaining the problem has always worked in my favor. Being a PC tech/engineer myself I cannot begin to explain the depth of my utter disdain for people who can't follow simple printed directions and then call me to yell and stomp their feet. It would be like calling a car dealership and screaming at them because your car won't start and YOU didn't put gas in it.
If you find that "priming" your carts is an absolute must,(I am pretty sure a LOT of people would be fairly mad if these units popped the attys due to lack of initial priming) I can suggest this method, although you will use up a cart in the process. Get a pair of latex gloves (IMPORTANT, getting juice all over your hands, you WILL absorb the nicotine through your skin and you could have some pretty interesting effects.) take the filler material out of 1 cartridge, and squeeze the juice out and onto the atty wick. Now, I really think this is a bit excessive and probably not needed.
Relax, the hard part is over, You've made the decision to move over to the vapor side so just take it easy and make the best of it. It really is a ton of fun and this place, ECF, is like walking into a very large room of old friends who will help you on your journey.
Steelrat