Even with a cartotank set up, you can have wicking issues. Almost all of my mixes are 50/50 pg/vg and I don't just punch the cartos, I slot them with a huge cut off wheel, 1/16th in slot in the side (some people get a bit worried about the metal dust and cutoff wheel particles getting in the carto: I don't). This is using dual coil cartos, 6ml+ juice a day, and 12 watts.
Bottomfeeders are nice in certain situations. Reo doesn't do very well in super dusty environments like the automotive shop I work in, crud gets in the juice well. Monkeybox is absolutely fantastic, but it is HUGE, its a mod I use at home also because of the beautiful woodwork. Vmod always had issues leaking, and I gave up on it a long time ago: maybe they have fixed them by now?
The genesis rebuildables have tons of issues in their own right, fantastic when you get them working right, waaaay worse then a failommizer when they start acting up.