I research all the adjustable dumbbell on the market and end up buy these . I could not be more pleased . I have not encounter a single workout yet where the size of these baby make they inconvenient , whereas this be the chief complaint with many other adjustable . sure they rattle a bit at the top and bottom of rep , but most adjustable do and it be really not even worth consider as a negative aspect . switch weight be incredibly easy and fast . if you can get these for $ 300 , jump on they and do not look back . the other adustable try and mimic the same model -lrb- think selectech -rrb- , but Powerblock have the gut to actually design a product that do not compromise function for style .