I bought these because I needed a set of weights. I wanted to have adjustable dumbbells because I know I will need to increase the weight I lift as I get into better shape. This is an inexpensive, but good quality way to go. Each dumbbell alone, without plates or collars on it, is only 2.5 lbs - a great amount for beginners of all ages. But as you progress you can add up to a total of 40 lbs (20lb. each dumbbell) or even more if you buy additional individual weight plates, which I did see next to this box set at the store. I started using them with a 2.5 lb. plate on each for a workout dvd, then when I got tired 2/3 of the way through but didn't want to quit, I simply took off the 5 lbs. of plates and continued with just the 2.5 lb. handles. It isn't the most convenient adjustment method out there today, but the collars (pieces that hold the weights in place) do screw on and off very easily. This set looks good too, I don't feel bad leaving them out in plain sight. The only downside I would say is the size - they are a little bigger and bulkier than some dumbbells.
Overall, I got what I was expecting for a very fair price. I'm satisfied and would definitely recommend these to anyone!