First thing first : if you need weight higher than 24 pound , these be not the weight for you , as they be not expandable , unlike most other powerblock system . if you do not need heavier weight , however , look no further - these be the best , most durable , quickest adjust dumbbell you can get . it be a great set for home workout quick change to the amount you be lift , like p90x . I buy these weight as a gift for my wife , and she love they . before these , she be use resistance band for p90x , and since buy these , she have not look back . I have a heavier , expandable PowerBlock set , and try a few other in my search for those . the design of this set be my favorite . the biggest advantage be the speed and ease of switching . there be no internal handle weight that you have to remove and add to make small change , nor be there multiple dial that can take awhile to line up like with some competitor . you simply put the handle into the stack and adjust the bar . the set feel safe and solid , and this be of course more cost-effective and space-efficient than buy set of 3 , 6 , 9 , 12 , 15 , 18 , 21 , and 24 . for someone who be not look to add bulk or lift heavy weight , this be a excellent buy .