I have be use these sportblock for a little over a month now as part of my workout routine . for my purpose of gain a moderate amount of size and then tone , these have be perfect . I find the weight to be easy to swap between and relatively quick . it take a bit of practice -lrb- especially on carpet -rrb- to get the safety pin lock on the correct weight and securely . on carpet , the trick be to push down on the handle when insert the pin . just make sure it `` click '' when fully insert to know it be secure . rarely do I need to press pause between rep when need to swap to a heavier or lighter weight . the safety pin could use a re-design . it be plastic and flexible which can sometimes allow you to incorrectly misalign on two different weight , or split the pin around two weight . as long as you be pay attention , usually not a problem . pro : 3-24 lb be perfect for my frame and workout purpose I do not have 3 pair of standard weight sit around clutter my living room quick switch between weight be easy and color code rubberized grip be easy to grasp and do not slip con : the safetey pin be make of plastic and flex . minor issue , but the sticker on the top of the handle on my weight be not align properly . because it be a thick plastic sticker , it be cause a few scraped wrist . I just peel they off and re-applied . rattle a bit when move around but appear to be secure provide the pin be properly align I be very happy with these weight to date . they be well make overall , versatile , and easy to swap out during a workout routine . not to mention less clutter in the living room to keep the wife happy . bonus point !