I recently fell in love with carto's, I hated them when I first started vaping, one reason was that it seemed that I ALWAYS had to keep on filling them, and I got juice in my mouth all the time. I finally figured out the best way to use them. I got some soft top Boge carto's, and then fill from the top. Just pop the rubber top off of them, drip the juice directly onto the filling, you can see when they get full, then I put a drip tip on them and VAPE to my hearts content, I ended up actually getting a bottom feeding juice box so I didn't have to keep on filling the top, but that was later on.
Check out iVape.net, he has a GREAT price on Boge carto's. He actually has a sale on the regulars right now, $6.95 for a 5 pack, his LR are $7.95.
Cartomizers
I just ordered 4 packs of his LR Boge, and I turned my wife onto carto's, before all she would use was her tank attys, but once she tried a Boge LR carto with a drip tip, she fell in love with vaping. She is using them with an ego. I think they are only 2 ohm, so they shouldn't mess up an ego battery, however I think you are only supposed to use regular resistance atty's/carto's with ego batteries. But as I said these aren't 1.5, so I think they are good. Its something about a chip being in them I think its called a mofit? Mofset? Something like that. Anyway, check out the Boge with a drip tip, you'll love it.