I've been vaping on this for a while and I hope this review helps some of you. I am not an expert, but I am an avid vaper and will be reviewing from that perspective.
Build Quality: Top notch. I've dropped this a few times and the tank has held beautifully. I was afraid having dropped it on a concrete floor that it would break, but in my instance it did not. Maybe I just got lucky. I wish I could tell how thick the glass is...it looks pretty thick and I now feel it's solid and not going to break without some abuse. The glass came scratch free. The metal top is smooth and and free of visual imperfections. The metal bottom isn't as perfectly smooth as the top, but no one who is not examining it up close will ever see the minuscule imperfections.
Feel: It's heavy. Being glass and metal I expected it would be. It will make some setups top-heavy, so consider lying your equipment on it's side if it does not have a generous flat base. I'm mainly using it on an iTaste MVP, and so far it has not toppled. The top feels smooth on the lips but hard on the teeth. Definitely not something I want to bite down hard or chew on.
Vape Quality: So far I'm very very pleased on this aspect. I get heavy vapor and it's a joy use. However, if you're big on throat hit, this may not be for you. The vape is relatively cool being that it's a bottom coil passing through a metal tube. I like that, but I know not everyone will. Also being that it's a bottom coil, the liquid level can get pretty darn low and still vape well.
Cleaning: I cannot say this enough - when you remove the protank from your device, be sure you are grasping the textured bottom and not the glass or smooth metal components! It's a bottom fill and I had a minor juicetastrophy because I unscrewed it and the bottom stayed attached to the device and the tank came off, spilling what was left in the tank. That was my fault, but seriously, be aware. I typically clean my equipment with a sink sprayer, not a great idea with this. The top does not come off and if the water jet is too fast, it will come squirting back at you. I use a lower setting on my sink sprayer for this one. Otherwise it cleans up just fine.
Pro: I can use polycarbonate-unfriendly juices in it and that makes me very happy. The beauty ring that comes with the protank works great on the iTaste MVP and looks better than the ring the MVP came with. New heads are relatively inexpensive.
Con: Extra care not to let the device tip over. Glass breaks. A little extra care goes a long way.
Recommended? Yes, I would buy this again.