When I started, no one mentioned back ups. I wasn't on ECF, but I was very adamant about no cigs, and my quote below says it all in a statement.
But, I wanted extra tanks to have different flavors always available and coils and two additional batteries, one for the car. Having said spare everything forthe car is what did it. No way was I going to work with just one system. I am always near the car so I stole a Tupperware container from my wife and started filling it. That made me think of a spare mod.
So, whenever I bought a new mod, it was better than my old mod and my old mod became a back-up.
Spares are very good. I never had to feel the pressure to stop and buy cigs.
If you are limited on money, get something just have a spare for now.
Have no mercy and WIN!