Oh you will love those carto's than. The one's I purchased I've filled maybe 20+ times and cleaned 2/3x and they still work like a champ. The filler still gets bright white after cleaning. I've only had issues with 1 of them not getting clean enough but that was because of the juice. GL, also if you wana try 510 type connection items they sell adapters for that stuff. Not sure if you have seen the madvapes website but it will blow your mind with options.
GL!