I love carto-tanks. But, I did get off to a bad start with them.
A year and a half ago I bought my first carto-tanks. The cartos were pre-punched with THREE holes! I stubbornly kept trying to make them work to no avail. I use 70 - 80% PG. So, you can imagine what a mess I had.
It took a long time for me to get around to buying cartos with fewer holes since I went through a long period where I didn't buy anything at all because I was so broke. I hesitated to take the risk of spending money on anything, especially to try something I wasn't sure of.
But, there was a happy ending, eventually. My juice is so thin that I need to use 1-hole cartos during the heat of the summer if I might be out driving around. But, it works! Cartos last 1 1/2 to 3 weeks. I just fill up once or twice a day and vape on!
I am interested in RBAs, but mainly for Vapocalypse. Although, if I happen to get good enough at it and like it, who knows? Until then, I love carto-tanks with a little dripping with a 306 on the side.