The difference would be no glue. That's nice that some people got good protanks, but I wasted $60 on protanks that couldn't take the heat. I wouldn't spend $5 on a 1.0 protank unless the 'new' adhesive they used was disclosed.
I've read a few comments about the puritank coming apart as well. No thanks. I don't have any more $20 bills to waste on garbage. If they can't find a heat-resistant adhesive that can also withstand chemical attack, they need to stick with glue-free from here on out. They need to stop stringing us along and use ceramics, pyrex, stainless steel, no adhesives, etc exclusively. Do they not test this stuff before mass producing it?
I have a feeling they think they are going to lose money if they give us the best they can (ie no planned obsolescence). What they don't realize, is that people like me (and I'm sure many others) can't convince everyone we know who smokes to make the switch with fiddly POS devices. It would also benifit China if more smokers here vaped ASAP, because we need as many voices as possible to push back against ridiculous regulations.
Sorry for the rant, but for me personally, Protank 1.0 was a fail that made me lose money AND start smoking again. I vowed to never buy from Kanger again, but I'm considering MAYBE giving them a chance with 2.0.
tl;dr
These new devices are 1000x better than glued together crap. We aren't going to win over health professionals and the general public by inhaling toxic adhesives and off-gassing plastics.