There are basically two distict types of juice delivery devices: string wicked devices such as clearomizers and clearotanks (vivi nova) and cartotanks.
I've never been a fan of the string-wicked delivery devices. I have found that they are inconsistant in performance and mute many of our e-liquid flavors. You also have to tip them on their side frequently to keep the wicks wet to avoid dry hits.
My preference is to use cartotanks. They are more consistant in performance once you get the methodology of them figured out, and provide more flavor. They perform the same no matter what position they are used. The surface area of the polyfill is ten times larger than the surface area of a clearo delivery device bringing the juice to the heating coil, so logic dictates they will provide more flavor.
I've written several blog articles on
the more common juice delivery devices that show pictures and videos on how to fill them here
http://www.e-cigarette-forum.com/fo...k-what-primer-juice-delivery-attachments.html
and
how to set up a cartotank here
http://www.e-cigarette-forum.com/forum/blogs/baditude/3710-5-cartomizer-tank-setup.html
and made a comprehensive
review of a popular pyrex cartotank manufacturer here
http://www.e-cigarette-forum.com/forum/blogs/baditude/3318-3-ibtanked-pyrex-glass-tanks-review.html
made a
list of online vendors that sell pre-punched cartomizers for cartotanks with an article on
how to choose the correct ohm carto for the voltage range you use here
http://www.e-cigarette-forum.com/fo...nched-single-coil-cartomizers-cartotanks.html
The above articles are a wealth of information compiled for your use, all in one place. All the rest can be found in the
link below my avatar in the blog entries "
6".
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Above are cartotanks on eGo batteries.