I just tried the brass screen mod and it vapes GREAT The largest clouds of pure good tasting vapor you can imagine) and I can fill without removing screens but I have one little complaint and wonder if anybody else has experienced this. When I inhale I get a slight gurgling that I do not like - Has any else experienced this and is there a fix? But if this is inherent in the design I can live with this - It vapes well all the way until the cart is empty. Nothing else I've tried does this well. Would love to hear any comments on this.