My fave samples pack is WOW Tobacco Shop (the one with WOWBoy), fave vanilla is WOW Vanilla
I recommend manual batteries - easier to get a good hit, harder to damage/kill with
juice leaks. I like V4L batteries because they have the long cutoff (you can take long drags). I use a plastic or delrin drip tip as a mouthpiece on my main cartos. Makes it cool and comfortable, easy to remove to look at stuffing or add
juice. Always take the carto off the battery when adding
juice. never screw anything in or on any further than necessery to contact and work (cartos, chargers, etc)
Also try the cartos from SmokelessImage or Bloogplanet or Halocigs G6
if you buy juices elsewhere I recommend PG w/ 10-20% VG. 30% works but it may shorten the life of the carto. Only put juices you like in cartos. Thick juices (high VG) do not work well in slim ecig cartos. I also avoid juices that drop a lot of flavoring sediment (clogs a carto ruining drag and shortening life of carto.
To test juice on a manual V4L battery use a standard resistance DSE901 atomizer and drip tip (see LiteCigUSA.net). Drip tip is not recommend with an atomizer on auto batteries. You could use DSE901 cartridges and atomizer to test juices on an auto.
Vapor4Life forum here includes a User Guide and a fix video for if you ever get a carto that doesn't make electrical contact.
Vapor4Life
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How I fill Vapor4Life KR8 cartos and Boge 510 cartos
With the carto off the battery... Pop out the soft cap with an unbent paperclip in the mouth hole, very careful not to catch stuffing or the wire loop.
Shake and open the eliquid
Fill
Hold a bit of tissue on the threaded end hole, tilt the carto, and add 18 drops per ml of capacity into the stuffing (Boges and most KR8 cartos are about 1ml).
Wait 15 seconds or so then see how many more drops the carto stuffing will soak in easily.
Cleanup
Clean up the threaded end, tilt open end down into tissue, puff into threaded end to clear air channel (Boges and the KR8 cartos I use have a defined center air channel and I want to see light through that) While the carto is still open end down, touch a soft bunch of tissue to the top of the stuffing to get the loose juice - this will help prevent leaks.
Settle (first fill only)
Cap and let it settle - I lay it on different sides for 15-20 minutes to make sure every bit of stuffing gets damp so I won't singe the carto. if you use thicker juice than me (I use 20% Vg or less) then you may need to wait much longer.
While vaping
While vaping, if the vapor gets a bit light or a bit dry or the carto is getting hotter than normal, I take the carto off the battery and add eliquid. Also, I use such light sediment-free juices, I can look at the stuffing and see if it needs juice because the stuffing goes back to near-white.
I often use a plastic or delrin drip tip as a mouthpiece on Boge and KR8 cartos (not to drip into since the juice would head for the central air channel). Easy to pop out to add juice.