I buy this dumbbell set to use for Chalean Extreme and P90X , and it be a great investment ! I be definitely intimidate by the price but after research other adjustable set , like the Bowflex Selecttech weight and other cheaper alternative , I go ahead and buy the Powerblocks . and it be a good thing I do ! they be space-efficient , easy-to-use , and a good price consider what you be get . the design be a little funkier to use than traditional dumbbell , but you adjust you workout to it , and I hardly notice anymore after use it . I debate buy separate set of weight but the price of all those amount to roughly the price of the Powerblocks and would take up a immense amount of space in my compact living room . I be able to purchase these at my local sport goods store for about $ 160 which be cheaper than Amazon , so I suggest that you google and shop around in you area if you want to save some money . but I would definitely say if you be on the bubble about purchase these because you be throw off by the price , do it !!! if you be commit about get fit and strong , you will need a wide range of weight and these be the best value . if you only plan to apply work out and strength training to be a temporary thing instead of a lifestyle , then definitely save you money and buy that one pair of 5 pound neoprene dumbbell .