Ha! Until I read what others posted, I totally forgot it was a China-manufactured product. Mine has its flaws, but so does my O. My expectations of this thing are what killed it for me.
J, do you mind if I ask what kind of coils you put in your Hadalay? I ask because I have tried (I think it was fused) Claptons, tiger wire (and some other "flavor coils") and the flavor was good, like really good. But IME those coils can do that in a plethora of drippers that are not considered flavor atties.
In the Hadalay, I tried using several guages of kanthal, in single or dual, in differernt positions, but the flavor was practically absent. In the NarDA or the O, I can get great flavor with a simple coil (or coils). Those are great without those special coils, but also great without them.
For me, price, scarcity and all that mean nothing -- wait, that is not true. If a device is all unicorned out, it better perform great! I won't really debate the price because I still by pre-made juice: the biggest racket in vaping.
But I will say that buying the slam cap for the O was a DUMB decision on my part. I HATE that thing more than the Hadalay, and they cost about the same... and it is just a stupid delrin cap.