i consider the boxes or any kief extraction device more of a tool than anything.
its like giving a hammer nails and wood to someone(non carpenter) and saying frame a house. yes you can do it but it is YOU that makes the dry sift. to bash the boxes is like someone bashing a hammer and nails cause they cant frame a house. the bubblebox is just a tool in my opinion(a quality one). if you want a quality tool for cleaning kief i would recommend the bubblebox and the screen set. the screen set works awesome. recently been using it to rough card bud over and i can still achieve a melty dry sift. even on the 107 great hashmaking/cleaning tools so id say bubblebox over those other boxes. thats just my opinion tho hehe. peace.