My main issue with Rotor speed feeds is that you cant open the speed feed and place balls in the loader
Example between points when your in a rush and only have 2 minutes with normal speed feeds you have to manually push balls through the feed in order to stop the rattle
I find the best loader is the Virtue crown as you can open the lid/speed feed and put as many balls in as you would like instantly, only down side is that the virtue speed feed is raised about 1cm or so higher than the loader
I now use the Virtue Crown SF, very rare as they are EXPENSIVE but excellent feed and retention, I also recommend HK Epic speedfeed which comes with additional rain lid and KM Spine speedfeed which comes with lifetime replacement warranty.