Powerblock dumbbells are one of the most popular adjustable, quick change dumbbells on. Powerblock dumbbells are box like, and there are supports for your writes around the handle. They may bother some users, simply because they're comfortable with the feel of regular dumbbell sets. The drawback however, is that the price of these adjustable free weights are more expensive than the powerblocks. Pound for pound, the powerbock weight set is going to be easier on your budget.