Just received the two I ordered from Virgin Vapor. I have been tearing my hair out trying to find a cartomizer that is reliable and does not leak, clog up or break. This looks extremely well made. I like the way the mouthpiece screws onto the plastic and the bottom seems to be very secure. I'm vaping on a Riva 510 and it fits like a glove. However I have a question. I just filled it with BWB's 18mg Expresso (I tend to vape a lot of coffee flavors) and on the other cartos I've used I always get that good robust coffee taste and TH. On the Vision (2.1 - 2.4 ohms) I filled it to capacity and started vaping. Cannot taste the coffee and very little TH with kind of a weird taste. Should I have done some dry burns before filling to take off the primer if this is what I'm tasting? Also the video on GotVapes says these need to be "broken in" so I'm hoping I will start tasting my juice and getting a better TH. Any comments?. Oh I also usually vape either 100% VG or higher mixture of VG vs PG. I just got in some juice from The Vapor Room and I'm trying a 50/50 mix.