Well some regular vape mods can use nicotine salts, so I don't see what's unique. Never tried these so I have no idea why that's different as I said. Just what I picked up from the buzz around their launch about the "faster better hit".
what's unique is that juul goes at 50mg of nic, where most small operators would stop at 20mg. with step downs all the way to 0mg. juul only offers 50mg. (20mg in Europe as that is the legal max)