cage question

hey has anyone tried this product the ultimate plant cage? I tried one for my last harvest. Im thinking about gettin more for the rest of my trays. my numbers seemed to have increased on the ones i used these cages on, but i think it wud be better to test on a bigger sample size. anyone have any thoughts...or used them before?

its understandable that your yields are greater since the cage allows light to reach the plants interior.