You sound exactly like me when I discovered the REOS! What is this magical wizardry?! This is really cool!
But yean, just like any vape juice delivery system, the coil will need cleaning or rebuilding (if you're running an RBA--cartos are different, just screw a new one on top). It's a pretty "mess" free system overall (infinitely "cleaner" than the clearos on an ego battery I formerly used). However, the ritual of maintaining, cleaning, rebuilding is sort of something that we Reonauts like to do. Otherwise, we'd get really bored, since there's not much else to do than change out the battery and refill the bottle every morning. Yeah, it's that easy...