For me, each tank contains enough
juice to last about as long as 2 or 3 stinkies. In terms of wear and tear they last until I throw them out because the (mouth end) end caps get a bit loose. I guess thats 3 months or so.
I use a set of 9, 2 in the cigs and 7 in a tin. I fill them last thing every night, every 2 weeks or so I swap them for another set and wash them and replace the (battery end) end caps.
I've found the atomizers last ages, I guess 3 months or so.
After about 3 month use the small batteries start running out quicker, I swapped my big battery after 6 months, it was starting to run out mid evening instead of last thing at night.
I spend about 10 mins at the end of each day refilling them (needle bottles are best, the tank is very small and its easy to get a bubble in there that stops them filling) and wiping them down with a bit of kitchen towel. The fortnightly clean takes about 10 mins, I rinse in hot water an a very little washing up liquid, soak, then soak in surgical spirit, then clean hot water, then leave to dry. I'm really not sure if the spirit is really needed, also it does leave a bit of a taste. I may skip it next time.
The biggest issue I've had is trying to fill from a bottle with a plastic wide-ish needle tip, I got some bottle caps with metal tips and filling is much easier.
If you want to chain vape for more than 20 mins, you may find them frustrating, I got an ego-CC for just those situations.
Overall, great for hands free, vape miles better than cigalikes, fells good clamped in gob. OK but not brilliant for extended vape sessions. Bit of a faff keeping the
tanks clean, not sure if you really need to, but I just feel some things going to breed in there if you don't.
You will have to replace batteries of both sorts and buy tanks and end caps, but still loads cheaper than burning leaves.
Sometime leaks a very tiny bit, not enough to be a problem unless you put them in tight white trouser pockets.