I received my Cthulhu Hastur 88w mod early this week.
The battery tube, buttons and screws are 304 SS. The section where the board is located is aviation aluminum. It's CNC machined. Very solidly built and IMO on par with my Squid DB's in that regard. Top notch quality all around.
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It uses Cthulhu's own Atom chip. The chip does wattage, TC (SS, TI, NI, TCR) and bypass. The UI is super easy to navigate. The color display is bright and easy to read outdoors in direct sunlight.
Here is mine with the Pocket v2 RTA (22mm). The Project X (22.5mm) fits nicely. A 24mm atty would overhang slightly.
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Size wise it's 3mm shorter than a JAC DNA75 and 5mm taller than a Colossal. About the same width as a JAC. It is very comfy in-hand.
I've put it through its paces in all modes. Not much to say about wattage or bypass other than they just work. Cthulhu did a fine job with TC. Their TC is very much on par with an Asmodus Colossal or the Geek Vape Aegis Solo. I ran several tanks completely empty with no dry hits or wick burn.
Would I recommend it? Yes. Would I buy another? Yes. IMO Cthulhu did an excellent job with the Hastur 88w mod.
I bought mine from Vapelink (UK). Shipping was fairly quick at 8 days.
Cthulhu Hastur 88W Mod