Just to add my 2 cents. 
I still use my eGo-C atomizers and I like them, I also used the T atomizers before and I liked them--never had a problem or a leak. But the flavor is not as good as in my Kanger clearomizers or carto-tanks.
All those heads work--it just takes some time to learn how to use them correctly, as none of them are perfect or foolproof.
Good luck and happy vaping!
I still use my eGo-C atomizers and I like them, I also used the T atomizers before and I liked them--never had a problem or a leak. But the flavor is not as good as in my Kanger clearomizers or carto-tanks.
All those heads work--it just takes some time to learn how to use them correctly, as none of them are perfect or foolproof.
Good luck and happy vaping!