The "Spit Back Protection" does the following: as the name suggests, it protects you from the irritating spitbacks you get when your dripper gets "flooded" by your ejuice. it also serves as a "Flavor Booster" because of the hole size inside the driptip hole. It concentrates the vapor from the wick to your taste buds or mouth so that you taste your juice better.
NIMBUS is the ONLY Filipino Made Atomizer that has a Spit Back protection
The NIMBUS Atomizer has TWO insulators (another first here in the Philippines). The one on top is a soft insulator, this one serves as a warning about how you treat your NIMBUS, if it gets bloated you're it means you're torching your NIMBUS directly straight into the insulator(i know it sounds stupid, but a lot of people to this.) The other insulator on the bottom part is made of PA66 it's high heat resistance and placement makes it near impossible to destroy (not unless you're really trying to destroy it).
The Juice Well is a nice thing to add specially for some "Over Droppers" out there. With this, the excess juice that falls from your wick will stay below it and when it's time to the wick will absorb the excess juice too...so NO WASTED JUICE from your atty now
The Three Poles of the NIMBUS RA makes Dual Coil or even QUAD Coil builds easier to make. Oh and the holes in the poles makes rebuilding your wicks easier too!