I don't understand the problems people are having.
I have never used carts - only cartomizers for months and months.
Then last week I tried dripping - and liked it - only I only had 3 cheap 510 automatizes that I destroyed on my 5V.

So, I ordered an ego atomizer and an ego drip tip from Good Prophets which came Saturday - and they sent me a free cart!
That atomizer is huge! makes my ego look like a giant cigar - but dripping was easy and great - did so all weekend.
This morning right before I headed off to work I tore open the cart package - did nothing special - just removed the condo on the end - quickly squirted e-juice directly onto the filler that was there until it overflowed, then dabbed it with a paper towel to soaked up the overflow - stuck it on the atomizer and been vapping on it ever since - which includes chain vapping during my 40 min commute.
No problems - no hassles - a lot of vapor - but not as much as dripping - but I attribute that to the small hole in the mouthpiece of the cart. Do all carts have such small holes?

It seems cartomizers holes are about twice as big.
Anyway then I saw this thread and saw that people were having problems with these. To me it has been a hassle free introduction to carts, and I plan on ordering more carts and a couple of more ego atomizers today. I just wish they weren't so expensive almost twice the price of 510's - but they do look great!

-and I hope they last - I will not try them on my 5v though - 5V are atty killers, I don't mind so much it killing the cheapo cartomizers I use, but a $13 atomizer I can not afford to risk.