Are you referring to quality when you say lifespan? I've been told they are made exactly the same as the normal attys and the only difference is the warranty. If im not mistaken, you are still way better ordering these than 16 for one that has a supposed warranty. If you buy at cignot its guarantted only against man defects for 30 days not wear and tear or clogging. At clouds of vapor your warranty is for 14 days. At liberty flights its 45 days or 50ml juice (which for me is 10 days). Even when ordering straight from ovaleusa.com you only get a 60 day warranty on items.
Does this mean that you can continually use one atty without cleaning it and send it back every two weeks when its clogged and no longer works? I dont believe you could I think the warranty is for it working as intended which means it wouldnt cover wear and tear but more wick issues and such, which you usually know from day one.
This is how I see it, If i spend $60 i can get 6 attys tawa from ovale or 3 from another place that offers a warranty. Whats the chances of 3 out of my 6 attys not working? and even if 3 didnt and 3 did id be right where i would be if i had paid more plus no hassle of sending anything back. But instead if all 6 work fine, you got twice the amount for the same price. I orderd 6 of them, i test them all when they arrived and they worked the same as the 16 one i have.
If you can send them back and get a new one everytime the coil gets gunked up and dont have to clean them then your best bet is the 16 from ovale since the guarantee is 60 days and i didnt see any warnings that it was only against defects or a certain amount of juice.
If im really off base and you can send them back from clogging i would love someone to inform me since im lazy and dont want to clean them! lol