I've been through most of the cartos, tank styles, etc... tea bags, and all kinds of modding tanks and what goes into them.
Too much fiddling for me any more. I can't even find two ScubabatgenUS tanks I got in co-op and never used. I ask anyone to take a look at the complicated assembly and many, many parts, of some of the upper end tanks. Some of them have no less than 10 parts to assemble even before the coil/wick is built. I'm getting DH an ERA tank and Docs mini tank when they are available (via Freddie's, FB, pre-order) as they are slim and pocket friendly, and don't require much fiddling, but, damn, they each cost as much or more than a REO.
I've kept a few carto tanks, cheap to expensive like Phiniac tanks, only for emergency but now that super quality RBA tanks are coming out I'll probably let go of those carto tanks for good. Buzz Pro came in handy the other night when DH arrived from out of town with all discharged eGo batteries and only a little charge left in remaining Spinner he was using. It was faster to load some batteries up into Buzz Pro and switch DH's Mini Vivi Nova tank to it than to get out and prep a REO for him. (Besides I'll only let him use Silver Anodized any more due to his "abusing" them and his Silver Mini and My Silver VVG are packed up for visit to REO spa. He just gave me my near pristine old Silver Mini back last Wed and it had two new marks on it.
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Feisty Alice