absolutely no. . I have have these for a while , and finally come on line to write a review this morning after reach the end of my rope . they be extremely annoying . you have to be extremely careful in make sure the weight be face a certain direction when you lift they because the pin will slide out , most especially on exercise that alternate or flip wrist , like back tri extension or shoulder fly combo . this can be very dangerous and I often have to set the weight down and pick they back up again in the middle of a combo set . aggravate , counter productive , counter intuitive , time consuming . I can not emphasize enough how annoying it be to change the weight when alternate through lower weight , basically anything under 30 pound . to have to stop and open the whole system , remove the interior weight , re-pin the block , etc. . these two thing you will have to do on almost every exercise , so multiply this over and over by you whole workout and think many , many time before you buy .