the PowerBlock dumbbell set be great for someone like I who live in a apartment and have limit space . I get a full range of motion and the pin stay in place very securely so I never worry about have the weight above my head . sometimes the weight get stick when lower they into the unused plate , but if you keep it straight when you lower it there be no problem . I think the carpet allow they to move so I may get the tray or get some kind of hard surface to keep they from tilt . otherwise a great product that perform perfectly ! recommend :  PowerBlock Personal Set Tray