Figured I'd throw my $0.02 here. I just got a pack of these in today from cloudsofvapor. Here's my initial thought after a few hours with these.
Filling is SUPER easy. Pop cap off, take a bottle and drip down the side of the tube. DO NOT drip down the center tube that runs down the middle. Trust me!
I learned the hard way, that it's probably best to "dry burn" em a few times before filling. I got a very odd taste off of these first few puffs. I opened a 2nd one, dry burned (apply voltage til the coil turns bright red for a few seconds, then release). Let it sit for 10-15 seconds, and repeat. Do this a few times (i did it about 10 or 11 times) and then fill your
juice. For me, I had a better tasting vape coming out of the 2nd one.
With all of that said, at first I wasn't really impressed. I'm comparing these G4's to ce2 fluxomizers/clearomizers and boge 510 cartomizers, as those are my favorites. It's definitely a cooler taste, less throat hit than I expected. I guess it helps to tell you I'm using eGo regular and mega
batteries, so i assume I'm at 3.4v (not into HV or
mods).
From what I've read/heard, these G4s give off much better taste and hit at higher voltage. I do have a HV 510 passthru I might try when I get back from vacation, so I'll post a follow up in like a week.
At the moment, I'm not impressed. Again, I love how easy they are to fill. The tubes are muuuch thicker than the ce2/fluxomizer tubes. 510 drip tips aren't fitting, but no biggie because the mouthpiece is what seals the tube on these things. Drip tip would provide tons of leaking without using a seal ring off a ce2 underneath it.
Hope this helps. I use dekang mostly PG juices. Menthol tasted good but still weaker, Blueberry was ok too. RY4 was terrrrrrrrrible in this thing on an eGo battery, so YMMV.