My brother has a set, I think they are great since they don't take up nearly as much room as a regular set and they work just the same. He bought his 2nd hand so got a great deal, I would definitely get a set if I needed any dumbells (my building has a free gym so I am set right now), apparently there is a bar that can attach two of them into a barbell as well.
They tell you on their website who the dealers are in your area I think. Always worth checking out any classified ads in your area too, lots of people give up on working out and sell their stuff so they don't need to see it anymore.
