Hey ECF, I was about to pull the trigger on the ehpro kfl+ clone at vape royalty for $50 bucks but I am thinking that maybe I should drop the extra $40 and get the R91% with better airflow control. If I do go with the R91% it will ruin my $100 mech mod budget but I would rather do it right the first time than purchase a subpar rba. So in your opinion is the R91% worth $40 more than the ehpro kfl+? Is there a noticeable difference in performance between the two rba's?