Most people I know always complain about their broken vapers how expensive is repairing one. I usually take very good care of my things, but I understand that this is also some kind of a technical problem.
I had the same e-cig for over a year now and it still works fine. Sure, you need to be careful with it and keep it stored properly. I never heard no one complain about a broken vaper, and never saw one break down.
It's a good question really, but they seem pretty reliable. I am not seeing which parts are more susceptible of being damaged, but I think that repairs will more often result from misuse rather than something not working properly. Someone with more experience care to comment?
If you keep it stored properly, use it correctly, and maintain/ clean it, it should last a really long time with no major repairs. I've had mine for a year and a half with no problems whatsoever. If you just throw it in your bag or lose it in the couch you may run into problems a lot sooner.
Hmmm I'm not really sure what your asking. I bought a astro mod clone on ebay for 25$ and picked up a Igo w. I don't think I'll have to replace anything for a long long time besides wire and cotton. There's no need to buy the fancy stuff, just get a low ohm dual coil dripper and a mechanical mod and your good to go.