Just my opinion - I'm new to vaping and my model has a hole in its battery (M402). I bought some cartos but I'm a bit wary of one dripping a bunch of juice and killing my battery or atty or both. So I bought a 3rd battery and atty and then I'll try cartos haha. I can't drip with my model. I can dip but I do only get 3-5 drags off of that. With a new cart, nicely topped off, I can get a lot more drags than with a dip. M402 has tiny carts but it also doesn't burn a ton of vapor at once.
So right now I am not minding carts. I am almost always at home or at work and I can easily top off a cart in either place. My boss doesn't care. I still have to learn how to clean, refluff, replace the stuffing because after I used the same cart for a few days it was not performing well at all - frequent topping off, etc. like you said.