mitchgo61
I go where the thrills are
I just got mine and had black in my abv as well. I'm using the method explained by The Vape Critic in his review, heat up for 8-10 sec, let go, press again and draw. Maybe I'm holding it too long on the draw?
If you are getting charred bits so early on, it's likely due to the second button press. Press it once, hold for a four count or until you see the glow, and then begin drawing. Don't hit the button a second time...that'll start the heat cycle again and give you the hottest part of the cycle mid-hit which can cause it to run a little hot. Give it a try without releasing the button, and see if that helps.
As far as failure rate goes, my third Firefly just quit. That doesn't mean that I own three of these vapes, it means that I have had three failures. Firefly has always been very good about replacement, no complaints there, but I'm pretty tired of having to pay to ship it, then wait to get it back again. There has got to be an issue with the heating coil breaking over time. I purchased it in January, and I raved about it.(still do) but it lasted one month, then green light blinking but no heat. The second one worked for almost exactly the same time, one month. I thought about selling the third unit, an unopened and new replacement, but broke down and opened the box one day after holding on to it for about a month. This one lasted about 7 months. We have no way of knowing what the overall failure rate is, but to me.. it seems quite high.
Why are they making you pay to ship it? They should pay both ways when it fails under warranty. They always have with me. (And that's like six times or something.)