Yeah those things were my first venture into the world of vaping from being a 15+ per day roll up smoker. I used two disposable ones, it was cool being able to sit at my desk and use one when I felt like I wanted a rolly but I soon found myself braving the elements and getting stinky fingers to feel satisfied enough. Quickly stopped bothering with them.
It was a friends ce4 + ego with some 'i-Breathe' cherry e liquid which tempted to give it another bash, even then I still sort of struggled until I tried out a different friends ego with a mini protank 2 on top, bought the exact same setup and liquids from the same place as him 15 minutes later and since, I've only faulted a few times when drunk and once getting tattooed! And that was in September last year.