My Slims - the two V1's are coming up for 3 years old later this year, the V3 not far behind.
The aluminium one is showing its age now but it has seen the most use, when the threads are clean it works the best.
I read further back in the thread that the 10440
batteries are short lived. I would tend to agree, but sometimes you get a battery that just seems to work much longer than average. I only ever got around 20 mins chain
vaping from 10440's, even though I see people mention 1 or 2 hours - I suppose it depends on how you use it.
I still prefer these for outdoor use, it's hard to beat the size vs. power of them, even though I have a more powerful
mod now for home use.
Below is a picture I took of V1 Slim with V1 Line, it works but I haven't tested how long the battery lasts yet - not too long I suspect. Those are not scratches on the Slim, it is kind of a cracking of the surface layer, like lacquer crazing on a vintage guitar - I don't know if it is due to constant heating/cooling in the cold weather here, corrosive effects of the e-liquid over the years, or just plain aluminium oxidisation taking hold because I don't keep it polished. It could be buffed out (except at the ends) but I don't mind it.