For the price this cannot be faulted. Took a gamble on this and it's much better than I expected. For full review and breakdown with pictures see this thread.- https://www.fasttech.com/forums/2065300/t/1549137/versus-sigelei-100w-plus-review-with-pictures

I don't normally leave reviews, but judging by some of the reviews left here I felt obliged to put pen to paper. Yes, they have no instructions, so it took me all of 30 seconds to figure these out for myself. 1. Open case. 2. Common sense told me the spring is for the negative contact. (After reading one of these reviews I looked hard inside, and there is a '+' moulded on the sled for the positive contact)! 3. Close case. 4. Click button once to turn on, twice to turn off. Will auto turn on when you connect it to your phone etc. 5. Blue LED illuminates when bank is in use or when you are charging it. I charge batteries externally though. 6. Press and hold the button and the LED becomes a very bright white torch light, press and hold again to turn the torch off. I have several powerbanks, both standalone and vaping mods with a powerbank facility, and this beauty on a mAh for mAh basis is by far the most efficient, and this is the only powerbank I have that does not get in the slightest bit warm. If you have spare 18650's buy this.

Out of the box very clean and tidy. Stripped and washed then first build. First build done in a hurry, probably worst coil I have ever built. Resistance all over the place, different every puff. First thing I noticed was that drip tip due to patterning on it was very uncomfortable on the teeth, so changed for one of my own. Tank O rings a PITA to get back in. Too unstable in first build form so re-built. Much better with constant resistance. Changed the post screws to the spares in the spares pack, they are different to ones pre-installed in atomizer, larger heads that hold down coil wires better. Very good vapour production though the vapour is very cool. If you put on a mod that is bigger in diameter than the Squape itself the AFC is very difficult to adjust, easier to unscrew atty then adjust AFC which when opened fully is very airy, half way suits me. Flavour on juice seems muted. Maybe with practice it will get better but feels a little anti-climatic at the moment.

Ordered these because they looked interesting. When they came today, was pleasantly surprised about the quality, they are pretty sturdy, (time will tell). Took out the clear one and noticed rather a lot of room around coil because of physical size of body. Washed out and re-wicked coil with cotton, making wick slightly longer than you would with Evod type coils because of aforementioned space that can accommodate longer wick. Left original coil in. It goes like a steam train, loads of vapour, slightly warmed. Fairly airy draw. Using on a Kamry X6 battery with adaptor because of depth of well around battery connector, still looks pretty seamless though. Impressed with these.

I have a feeling in this version at least, this is the one I received, it is a bit of a lottery. Mine came with a missing o-ring and no spring installed, but I familiarised myself with the schematic before playing with it, it dry hit at first, but that was my fault for getting the juice control ass about face in my own head. Since re-wiring my brain, lol, it works as intended. It was oily and some swarf present, but that is to be expected. I have not had a single drop leak, a world first for a Kayfun! It seems a lot of problems with this version are user errors and I include myself in that one. It is a complex little bugger but once mastered is almost worth the wait. Best feature is the top fill which is the best I have ever come across. All this for, by today's standards, mediocre performance.