Well Drew I just put the igo crystal rebuildable through the "rented mule" test. The 2.4 ohm coil didn't really have the kick I was looking for, however Mrs. Huffin loved them. Last week I ordered the 1.8 ohm coil and BLAMO The vap production was equal too or better than dripping a fresh cisco 901LR I am averaging 4 refills per day and the 1.8 is still going strong If it only lasts a week its a great bargain. The coil connection needs to wiped off between the second and third fill to maintain a good connection. Usually I somehow manage to crack the plastic at the base on these types of refillable's. The base connection between my adapter and the crystal is seeing plenty of action and so far I have no sign of stress fractures. Running it on a Riva I do not have to swap out batts until early evening. Yup.. this is a real winner. I just ordered my second rebuildable along with five 1.8 long wicks. I would venture a guess that my previous forty or so orders have always contained a couple of 901LR and a Mega dual coil since their introduction. Ease of use and its ability to maintain a good clean consistent flavor may permanently move this to the top of my list. With the crystals versatility it covers a lot of bases for just about any type of vaping experience.