Just got home and vaped the 2 devices. I'll start with the DID. Filled it with fresh juice and coil is at 2.8 Ohms. The wrap looks good and the wick is not touching the floor. Vaped it at 4.9 volts with a decent cloud if I draw long enough. Flavor is muted. Turned it up to 5.3 and the cloud is decent and flavor is still muted. Draw is tight and I had to draw real hard and sharp (more air more vapor). After maybe 10 - 15 draws the top cap and drip tip is hot. If I keep going heat will transfer to the tank. Come to think of it, I don't think I can keep going because the drip tip will get so hot it will burn my lip. I think that the air hole is too small to let enough air in to keep the unit cool and thus produces less vapor.
The ZAP is at 2 Ohms vaping at 5.1 volts. I get a big cloud and flavorful taste. After a session the unit is just warm to the touch. You know I used to think loose draw is lame because I'm so used to the Boge and tank vapes but when it comes to this Genesis style of vaping the ZAP has the perfect draw. Taking another draw right now, cigar style. Primer draw, then 2 second draw, big clouds. It's perfect I wouldn't want a stiffer or looser draw than this. Only drawback on this device is that it leaks if you set it down sideways so it's my stay at home vape and I do think about it when I'm away. If they make the fill hole like the DID this would be super.
Someone mentioned the Bliss or Cobra is a good device. Once I get either one I'm gonna say bye bye to the DID. Maybe even sooner.