My mom likes the kayfun rta's, I never had much luck with them. Too open for mtl, too tight for direct lung. The draw on the older ce4 type clearomizers was pretty similar to smoking, the kfv5 was just ridonkulous for mtl airflow. It's like trying to smoke a cigarette that has no filter and half the stuffing fell out so it's all paper lol. Only comparing things to my previous bad habits in terms of a cig replacement.
Direct lung isn't similar to smoking but I've noticed that vapor is a lot 'fluffier' than smoke. The larger volume of dl vapor gives me the kind of lung hit that smoking used to, just something that was personally missing to me in mtl setups. It was like taking a 'drag', nice flavor and then poof, gone, nothing but empty air. Similar to a mouthful of cotton candy that just disappears and you're not really eating anything.
Everyone seems to be different in what they like to vape or how they like to vape. Similar to smoking I guess. Some people I remember smoking a few puffs and tossing it out. Some do little baby mouth puffs and hardly inhale. Some hotbox the thing until they've got a 2" long cherry lol. I was always one of those who took long drags and sometimes held it in for a min so I guess I missed the chest hit more than the throat hit.