these PowerBlock dumbbell be great . they be compact and switch the amount of weight be really quick and easy . we also have the Bowflex adjustable dumbbell , but compare to the PowerBlocks they be large and cumbersome . I wish I have get the PowerBlocks to begin with ! the only thing that could have make this product better be if it come with the holder and\/or stand . I do not knock of any star for that , though , since it be clear from the product description .