I've got 2 kits from Jason, also 1 Dura and 3 Dura-C kits. Both the kits I got from Jason I bought with automatic batteries. The 1st kit I lost 2 atoms in 2 days. One with less than an hour on it. I also returned one of the batteries. I don't know why the atoms died, but I don't think it was human error. I'm not new to e-cigs, have several atoms of varying models, all going on months of use.
Not that it matters, but that first kit Jason was nice enough to have shipped from another supplier as I really needed it and he was out, so it wasn't from his stock. He was fast and friendly with replacements. One of the batteries from the second kit may be acting up. Currently I have it out on loan and the person with it says it doesn't seem to be holding a charge. I haven't determined yet if it's truly the battery or human error.
I have also had a Dura-C atom die. About 3 days use on it. Also on loan, so not 100% sure of the death at this point, but it sounds just like the other 2. Basically, you're using, all is well, you disassemble and set to drain. Next time you pick up to use, nothing. It's just cold.
All my carts from Jason have been the new design. I have not had any leaking issues from the carts. I have not had any issues yet with the manual buttons sticking on any of the Dura-Cs.
My Gma has one of the kits I loaned out and has already purchased and received a kit from Jason. Ordered late Fri, received Mon. One of the manual batteries was dead from the 1st charge. Replacement coming soon. So far the atoms both work. Don't know about the auto batts yet. She loves it.
The person with the loaned kit that the batt isn't holding the charge also wants to order. She loves it.
So I think there are definite durability issues with the Yeti/510/Dura-C at this point in time. May be true for all models/manufacturers across the board as they struggle to meet our demand. I haven't ordered any other models lately, so I can't say. Right now I think it's completely hit or miss, but you will know within the 2 weeks if a part is a dud and Jason is fast about getting things up and running again. Once you get solid parts for everything, I think you will like it. If you have nothing else to use at home, I wouldn't even think of ordering less than 2 kits.
Despite the issues they've had, the people I've got loaners out to that have used them all want their own kits. So far they've all decided to order from Jason.