Hi! I signed up just to reply to this question as a non-professional.
I have vaped on and off for three yearsish, starting with the 510.
Personally, my failures are always a result of equipment failures or running out of supplies.
My local drugstore (Walgreens) stocks the Blu starter kit and carts. It is huge piece of mind knowing that i can resupply instantly as I once again wien myself from analogs.
I do have a new found sense of simplicy as I stare at my old bucket of mismatched parts, carts, bottles, syringes and tweezers.
The $50 kit has 2 batteries, 5 cartomizers, a chargeable case, AC and USB adapters.
I only get about 30 mins of battery between charges, but they recharge quickly. And heck, i could buy another kit right down the road whenever I need it.
I love the hobby and DIY aspects of vaping. Perhaps enough that I end up over my head.
Thanks!