There is the eGo cartomizer (the one you are talking about)
and then there is 510 cartomizers.
They are smaller, but hold less liquid.
Maybe other can chime in on what they prefer.
I like the 510 cartomizers (currently out of stock, but could send one or two your way)
and they are great. I actually dont personally use the eGo cartomizer, but tend to like the
GP510 cartomizer.
We also have the True Joye 510 cartomizer coming in a few days (along with more GP510 cartomizers), but not sure on their performance
(I am sure there is already alot of info on them here)
They have the refilling technique similar to the eGo cartomizer.