I've owned a FlashVAPE for almost a week, and I think I have enough experience with one now to feel qualified to comment on it.
The FlashVAPE is a terrific bargain at $129. At almost 18 cm high (7 inches) and 344 g (just over 12 oz) the FV is a portable but not a pocket vaporizer. It is powered by a single 18650 li-ion battery that brings the FV up to vaporizing temperature in about 5 seconds and combustion in 10. There's no temperature control, so this power is a two-edged sword and is dangerous in the hands of the newbie. Fair warning: you will probably combust with this unit at least once, no matter how experienced you are. This should not stop you from getting one because once you learn to control it, the FV delivers in spades.
This is the portrait I shot the day I got it. I love the look. It reminds me of something out of SF from the 50s. If Flash Gordon had a vaporizer, it would have looked like this.
It is heavy but has a really nice feel in the hand. The build quality is extremely high. The swivel cap has a smooth turning action and is held on by friction with two O-rings. I thought this would be a weak point but I've shaken and whacked it mercilessly without a hint of dislodging it. This is a good thing because I shake the FV a lot.
If you use the FV as instructed, it is a conduction vaporizer. The heater is some distance below two fine mesh stainless steel screens that heat up when you press the button. Both screens heat up really fast, and your load sits on the top screen, so most of the vapour comes from conduction. The directions say press for 5 seconds, release, wait a second, then hit it. Shake and repeat for added bliss.
Shake it you must, because the FV is so powerful. Any material that sticks to the screen can easily char the second or third time you hit it. My habit is to open it up and check after the first hit of a new load, because that's the most likely time that I'll get sticking that I can't just shake around. FlashVAPE frowns on stirring because of the screen damage potential, but as long as you're gentle there's no risk. The FV screens aren't as delicate as the LB screen.
Although it's against my religion, the first time I used it I followed the directions to the letter and loaded the bowl about halfway. That's easily 4-5 MFLB trenches. I pressed, counted 6 seconds, and hit it. I got a small wispy stream with nice flavour, but it didn't quite work the way I expected. I expected to see vapour through the window in the swivel cap, but I didn't. Since I was heeding the warning about not holding the button too long, I went ahead and hit it and that's when I saw the vapour. Subsequent hits with longer button times showed thicker vapour, but I've not seen significant vapour through the window until I start to draw. I have, however, seen vapour back out through the air inlets.
If you puff into the stem even slightly, vapour immediately exhausts through the air inlet holes. It's not much but I've seen lots of posts obsessing over the slightest escape of vapour, so if you're one of those people you should be aware that this will happen. It doesn't bother me, since you can avoid it with a little care and the amount of vapour lost is neglible. It also illustrates how open and free-flowing the FV's airpath is. There is almost no resistance in the draw.
Continuing on, I tried a 7 count and got much thicker vapour. I'm methodical about this sort of thing so I then went for 8 seconds. I'd read that it builds power rapidly but I still wasn't prepared for how quickly. 2 seconds makes a huge difference. At 9 seconds, I got a bit of combustion.
I knew I would get combustion sooner or later because it was my intention to keep incrementing until it happened. As I said, I was just surprised at how soon it happened. I might as well mention here that after you combust, the FV tastes awful for a couple of bowls, just like the LB. I was careful to brush out every trace of the ash and do a couple of 10 second burns and then a 20 second one when the taste didn't clear. The bad news is that there's no quick cure. The good news is that the burnt taste fades fairly quickly.
If you follow the directions and never use it any other way, the FV will serve you well and you might never combust. Most people won't, however. It's tempting to try different techniques, and I for one would never be happy with a device that wants .5 g a bowl. So my first deviation was to see how the FV would work with the same load I'd put in the LB, which is usually a little bit less than .1 g. This amount doesn't really cover the screen. The FV has a huge bowl with ceramic sides, as you can see from this photo.
The diameter of that circle is 25 mm or about an inch. The depth is 15 mm or about .6 of an inch. You could keep your whole stash in there. FlashVAPE advises us to half fill that bowl! Fortunately, unlike the Pax you don't pack it down, because you want it loose so you can shake it around between hits. Now if you do that and don't burn your load, the bowl will last you a really long time. I can't tell you how long because a) I lost count almost immediately thanks to the effectiveness of the FV; b) I stopped when I burnt the load; and c) I am not inclined to ever load that much in a bowl again. I don't have to anyway, because the FV works just as well with a light load.
My next departure from the directions was to try hitting it while the power was on. I figured this would cool down the load enough that I'd have a bigger margin of error on the button, and it would also add some convection vapourizing. The ABV from my first couple of loads was uneven, so I was thinking this would make it come out nice and even, and it does. You can also get evenly browned ABV if you shake it properly, by the way, but I like the taste and thickness of the vapour I get this way: press power button, wait 5 seconds, hit for 3 seconds, release the button and finish the draw. This gives me a nice smooth hit that's full of flavour.
Let me digress for a moment to point out that the FV doesn't add any flavour of its own as far as I can tell, unless you've combusted in it recently. When I got it one of the first things I did was draw through each piece and then the whole unit, looking for any odd tastes. Everything was completely neutral to me.
Where was I? Concentrates. The instructions say you can use solid concentrates. I had nothing solid but I did have a vial of kief, so I figured I'd see what happened. It works. I was afraid that the kief would melt and stick to the screen. It did. I though maybe then it might combust, but I was conservative with my power button, and it never did. I should mention that I wouldn't have done this if the FV didn't have its two-screen system. In the picture above you can see a little tab on the top screen. Pull on that and the screen comes out easily, so it's really easy to clean if you clog it up with kief (which I did). The top screen protected the bottom screen perfectly. I don't think the FV would work for oils but it should handle bubble hash without any problem at all, and the only issue with kief is that you might be facing a little extra cleaning.
There's a lot I've left out but instead of turning this into a novel I'll wait for questions.
tl;dr buy a FlashVAPE. Be prepared for mistakes while you get the hang of it, but once you do, you'll love it.
Rest of my pictures are
posted on Imgur.