Well, after a month of using the blu, this is what all has worked for me and my standard plan. I do refills with the 25 carts that came with the whole blu package. Read about a lot of mods, and to be honest, haven't really had time to go out and by the materials to try the cart mods. I did try, and still using, a coffee filter mod. Cut out a .5 X 1.5 inch rectangle, folded it up to fit into the cup. Fill with ejuice and used that instead of the standard polyfill. It doesn't completely wick all the juice out, but a hell of a lot better than the polyfill and a lot less juice in the cup when the throat hit starts going away. I've found that one whole ecig, with cart and all fits in the far right hole, put the spare battery in the charge port and put one atty on a cart upside down whereas the atty is sticking up in one hole. Then all the others, 4 of them, I fill all 4 of them up with juice and put them in the hole with the the cart openings facing up so that all I do is remove the empty cart, then simply put the atty into a full cup, pull it out and good to go. I found that this can last me just about all day at work. Fill them up before I leave and good to go until I get ready to go to bed and refill them. Charge the PCC once every two days. works good. Have done a lot of reading here and I think the golden prize will be whomever finds the perfect fill. The bridge doesn't get hot, so finding a good wick material is just a matter of time. I've also learned that over time, the polyfill will start sticking to the bridge. I've seen some mods that tell you to roll the fill material in a circle and put it in the cup, but I've found that at least the atty's on the blu's have a tendency to grab the material and pull out when you go to fill the carts. I'm thinking the blue foam might be as close as we're going to get to the ideal fill. Another thing that you have to keep in mind is the density of the juice. Seems the PG is less dense than the VG, so if you use a real porious fill with PG, some of it may leak out of the cup, especially if you store it or lay it cart up. It will run down the sides and into the battery. I'm now having problems with one atty, but doing the dry burn cleaning method, seems to help it out for a couple of days. Also, the blu atty's don't like dark liquids.