First and foremost this is my first rdta experience. That being said I enjoy this product thoroughly. The fill method although not perfect is serviceable. The build deck is perfect for my building style (which is usually a 5 wrap 20g ss 3mm id) which the split 4 hole 2 post icon style deck accommodates well with the just the 2 center holes. I thoroughly enjoy how this device looks especially sitting on top of my comp lyfe spectrum. The adjustable 510 makes it exceptionaly safe on hybrid (direct battery to atty) devices. All that being said the top cap heats up faster than any device I have ever used before and there is a significant voltage drop associated with this device it feels much weaker with the same build on the same mods with the same batteries as other toppers. All in all I believe this device would be better suited to a regulated device which is a shame as I am a devout mech user, and am in love with the idea of an rdta on top of a mech. Well the search continues.