I've had these for over 5 years and can do all of the dumbbell work I need to with them. That being said, sometimes they get stuck when I'm switching weights and their length (even at light weights) means I sometimes hit my legs. I haven't had any durability issues, but I also never drop them. Hard to beat their price, especially if you can find them used, and they're a really reliable set of adjustable dumbbells.
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