It's really unfortunate the issue's I had with this mod, because with the vision carto's it come's with it works REALLY well. It come's with 4ohm carto's, but believe it or not this mod puts out such good power that they even work well on the 3.7V setting. Then when you turn it up to 5 or 6 volts its AWESOME! Unfortunately this device has some crazy issues with it. There are people who have this device and haven't seen this issue, and I have also seen those that have. Just unfortunate because it works really well with those visions if it didn't have all these other weird issues. Also, IMO it should be closer to the $50 range...not $65. But either way