The Sidesho is not a J118, the 902 is a J118 model.
Thanks for the clarification, Tony. I like my J118 a lot.
To John:
I wouldn't say I know a lot, but I am experienced in using many different types of PVs and liquid. The place I excel is in permitting myself to be relieved of much of my money! I'm somewhat OCD, and there are many setups that do the trick, but I'm always looking for something that works "better".
I think it's safe to say that refilling carts is cheaper than buying prefilled, but way more of a hassle. I use filled carts while on the go, and refill at home, or direct drip. I haven't been able to determine the limit of cart refilling, but I have carts I know I've filled 20 times. The filling has to be washed occasionally, possible even replaced.
Flavor is also a factor. Someone's favorite flavor may come from a bottle of eliquid, and someone else's comes from a prefilled cart. I've read many posts asking where someone may acquire a bottle of whatever comes in cart x or y.