My buddy snagged one of these a few weeks ago, and I must say, I am really really impressed by it. It, IMO, is the closest "dab" like hit from a pen. The carb button is really sweet and I think contributes to this, but I blow out HUGE clouds when I use this thing. Taste is decent. Really only ever need like a hit or two from it and I'll be good for awhile since the hits are so strong and fat.
I had a Source Orb, this kicks its ass. I have an Omicron and while it's nice, I think the Nyx hits harder. The Hercules too. Maybe the W9 products are a bit more flavor chasers (they do seem to taste better), but IMO neither compares to the lungfuls of clouds I can get from my buddies Nyx. If I was more into pens, I would certainly snag one.
Not sure how the efficiency is on it, but I imagine it's not as good as the Ceramic Rods. Just by design, I feel like the Quartz will get hotter quicker and vape everything up, and you can't really restabalize oil in a Quartz Rod (i think...) like you can with the ceramics.
I really dig it! I believe he has an Istick 40w, I'll mention the TC control to him.