wow... read all this stuff in the last few days...
20 gocarts here and every one of them works the same and they're 15 from nhailer 5 from cigeasy. Not much of a diff on em really other than the tube in the middle goes up higher & is bigger not to mention it's not a sticker on the cigeasy ones. Ordered more from nhailer just cuz they have the silver ones and I know they don't have stickers on em.
I have had some issues with a thicker liquid not wicking well too. I've also noticed a couple on the light flavored ones get a bad chemical flavor if I vape em to much in a row. Don't know if that's the "burnt" taste you all are referring too or not. Might just be my taste buds coming back and I never noticed that before....
The batteries though... they're all getting more & more touchy with the buttons. I have 4 batteries and all 4 I have to turn the button a tiny bit to get them to work from time to time. Other wise they turn on for a second then turn themselves off and I don't get any vape. If I use on in my left hand it's almost always a no go too. Kinda weird. 2 kits from each vender also.
29 days tonight though and still on the same gocarts I ordered. I have 1 gocart per flavor except for on that won't wick well, it's in 2 gocarts. The few flavors I vape every day I've had to clean the gocarts once each I think now but are still going just like when I got em.
Still really happy with it all in all! Ordering another 10 gocarts & 10 more flavors next month too. At that point some of the first 5ml of flavors should be gone & I can clean the gocarts they were in & see if I can use them for the fav flaves

Just wish I could figure out the button thing. One is really REALLY worse than the other 4 too, but it doesn't stop me from using it.