My friend gave me one of his Cthulhu RTA's, and so far I'm enjoying it. The closest thing I can compare it to is definitely my Goblin V2. The Cthulhu has about the same airflow, and overall vapes similarly. The juice channels are deeper and tends to run at a slightly higher wattage without dry hits. One of the only down sides I can think of is the useless bottom fill hole, which seems redundant and pointless to have on a top fill tank. My friends leaks at the bottom hole, and he can't make it stop. Mine hasn't started leaking yet, so maybe it'll be okay for now. I'm running a dual 26 gauge coil, wrapped 9 times on a 2.4mm screw driver. At 0.52 ohms, it's vaping nicely.
The Cthulhu is built like a tank, and is quite hefty for a small tank. It has considerably more parts than any of my other tanks, which isn't necessarily a bad thing. I think overall, I give this tank a big thumbs up. 8.5/10
*Oh, and I forgot about another negative, the grub screws, and the cheap driver they included. The allen wrench they include rounds out after the first build. My friend thought it was the screws, but after buying a quality set of allen wrenches, he found out the screws are actually okay, and it was just the allen wrench rounding off. I ordered a set like he has, and a pack of spare screws just in case they are needed. Only including 2 extra screws when the tank takes 4, makes no sense to me. It couldn't have cost them much to throw in 2 more screws.