As an ex smoker and now ex vaper, who wouldn't have quit cigs without vaping, Juul definitely feels to be something apart. Part of the problem, not the solution.
Their USP seems to be delivering a much higher "hit" more quickly, trying to give a hit like your first ever cigarette. Never tried one and don't intend to so have no clue how true this is, but it was definitely part of the buzz around them.