I have worked out on and off over the last 30 plus years. While I think the dumbbells are slightly over priced they are a good product and very useful for a person my age and for the shape I am in.
Pros: Durable, Easy To Use, Easy to adjust, Multifunctional
I purchased both the 552 and the set that goes to 90 lbs. I used to avidly go to the gym. Never missed. Now I have two babies and work all the time. I watched all my hard work over the years slip away. I have a full fledged smith machine in the garage that I have had for years but it's not heated or cooled out there and I can't hear the babies if they wake up. Knowing you can get a good workout on Dumbbells I purchased these for my wife and I to work out with because the small footprint they take up for the range of weights you get. Also, my wife needs higher reps and faster pace and the ability to switch weight as fast as you can on these Dumbbells is perfect for her to keep that heart rate up and burn off calories. The higher weight works great for me. You can get work out your entire body with a bench and a set of these Dumbbells and not lose a whole room to equipment.
Pros: Durable, Easy To Use, Multifunctional, Targets Muscles
They are a great design. Much better than having dozens of different weights all over the house. Easy to use. Great system of changing weight. Only negatives are the price. The center grip is a bit too thick and feels uncomfortable on the hand, and the weight plates shift while you are lifting so it takes a bit to get used to it. Overall I would recommend these simply for the ease of use and design.
Pros: Compact, Durable, Easy To Use, Multifunctional, Targets Muscles
Cons: High cost, Plates Shift, Unfomfortable Hand Grip
The weights are a little wider than I expected. This leads to having to hold the weights farther away From your body, for example when doing seated bicep curls. Not a show stopper. You just have to modify your Form in order to lift the weights without them contacting the bench
Pros: Durable, Easy To Use, Multifunctional, Targets Muscles