This is my pereference about the Synergy Caps.
Right now I personaly do not like them. I like pulling them, but when i’m doing some close and tight tricks, they get in the way either hitting the hub part and then gtting a knot inside of it and going o n on it like the cap is like another gap of a yoyo.
If you like tight tricks don’t get them. If you like far away spread out string tricks get them.
So threw out there good for loose, far away string tricks, but horrable for close, tight string tricks. it’s a pain to get the knot out of there.
Remember, this is my pereference. 
~Steven.