I ended up buying my mom an entire set up and a ton of VV samplers last spring. She gave it all back to me, never even touched the stuff. My mom, age 74, told me "I don't want to put anything else in my lungs!" and continues to smoke. Not only does she continue to smoke but she wears the patch along with smoking telling herself she is quitting. Sigh. I tried every stupid carto on the market to find something easy for her, including the Ego C. Too many products cracked, leaked, were too hard to fill, had to tinker to work properly, or had hardly any flavor.
Even though I am not fond of filler, in all my trials and errors and burning things up I personally have settled on:
Ego 1100 mah Twist with Cisco 2.0 attys. Use at home all the time. I like the flavor and got past the learning curve of using an atty.
Ego 650 mah with Boge 2.0 carto, and shorty drip tip for skiing and kayaking. Short, easy ... and if I lose it in a snow drift or a lake not too expensive.
Ego 1100 mah Twist with single coil 1.7 SmokeTech Resurrector for long car rides. Holds more
juice than the Boge and easy to top off in a dark car.
Ego 1100 mah Twist with Vivi Nova. Easy to fill, easy to clean. Top heavy and too easy for me to accidentally untwist the bottom and spill juice all over so use the Resurrector on long car rides.