I have been using the new G4 cartos for several weeks and it's time to report my thoughts on these. I have used them on multiple devices for a complete workout and used a 50/50 eliquid mix. I found the flavor and vapor production to be pretty consistent across the board. With the eGo the G4 is a superstar, nice throat hit, flavors were clean and true and vapor production was impressive. I found the same to be true on the Chuck at 3.7V, the vapor production here was a bit thicker, flavors were very true. At 5V I found the G4 to perform quite well also, no burned taste, big throat hit and tons of vapor, not a surprising find. What did surprise me was at higher volts the flavor still didn't suffer, that was a huge plus for me. I haven't really found any flavor degradation with continued use but I am also using multiple cartos with different flavors. On the two cartos I changed liquid flavors with I was pleased to find no real flavor mixing, very nice. I am not crazy about the mouthpiece but find the soft cap much nicer than the feel of a regular carto. I have removed the cap on one and carefully replaced it with a 510 drip tip and this works very well for me. No leaks with use, easy to refill, and the liquid lasts longer than I expected. I can go all evening on a single fill of 1ml, unexpected bonus. Available at wordupecigs the G4 cartos are very effective, easy to use, and give you the full flavor and vapor production we all are looking for. No leaking or burned flavors even at 5V these cartos have earned a place on my stock-up list.