I can't go back and read the 100 posts since I said I would post a review of the IGO-L so someone may already have posted a review, but oh well, another opinion can't be bad. This is long so if you want to skip, go to the bold parts if you want.
I won't go into detail about how the IGO-L works, or how I built a coil or anything like that, suffice to say with a dual coil metering at 1.6ohm, it's absolutely lovely - full-bodied flavor and huge clouds of vape. I personally did not use the original coils or silica it came with - but I did fire them up to see if they looked right and vaped - they did, although the coils look kind of ragged and I am not sure you will have a good experience with them over the longer term. The coils metered out at 1.9ohms.
I have not used the 'original' IGO-L and this is my first dripper, so full disclosure there, I have nothing to compare it with.
I am talking about the IGO-L from Fasttech
https://www.fasttech.com/products/1400500 currently $7.67
Packaging - comes in a plain white box with 2 ready built coils and silica wick already assembled and ready to go on the deck. You also get a small screwdriver and a pack of 2 spare wicks and 2 spare O rings. Nothing too fancy, but it is well protected in there and mine came fully assembled with no issues with things coming dislodged during shipping. 4/5
First Impressions - It's nice. The machining on the deck, the cap and the drip tip are excellent. No burrs, no scuffs, just really smooth stainless. The grooves cut into the cap are not sharp, and the 'layered look' (it kind of looks like that wooden dipper used to dispense honey) of the drip tip is machined well with smooth edges and no burrs or scuffs. Overall I would give it a 5/5 for quality of finish.
Just a word about the drip tip - I haven't used a drip tip with the tube this narrow - it has a great feeling around the lips, very comfortable.
Threading - I don't know what happened with this but the thread is perfect. It screws in straight and sits straight. No scraping noises when screwing in. 5/5 for threads (they are properly sealed around the base of the 510 connection too just like the original) I tried it in all of my devices and each one was excellent.
Fit and finish of O rings (including drip tip) - again, I cannot say anything negative about them. The cap is tight, very tight actually, although I suspect it will loosen up over time. The drip tip fits in the top with a positive click when it seats home. 5/5.
Overall - well I'm sure you can guess 5/5 - this little dripper surprised me with its quality, its fit and finish and its punch.
For $8 I recommend anyone thinking about getting an IGO-L, consider fasttech as a source. I will be ordering another, possibly 2 more to start a friend up with a dripper and to have a spare.
Sorry for the longwindedness (is that a word?) if you want specifics please ask me and I will do my best to give you the information.