I use this everyday .. have had it for a few weeks and the convenience of having all the various weights into one system is incredibly practical. The width of the system is, on the whole, bulkier than typical dumbbells, especially the smaller weights but I found it easy to get used to . So glad to have them accessible, without taking up significant living space. I can't judge whether they are good for serious weight lifters, but excellent for those serious on fitness.
Pros: Durable, Easy To Use, Multifunctional, Targets Muscles
Purchased a set for my wife. She loved how she could increase her weights with ease vrs the old fashion tear down and add more weights to get on with your workout ritual. These cut out all the muscle cool down and time lost and allows you to get on with your workout. My wife is now able to increase her weights in 2.5 lb increments and therefore build lean muscle more effectively. SO she bought me a set. I love the ease of these weights. I can keep up with my wife now! Up To this point we can't find any cons on these. We have had them for about 3 months now and use them 5 days out of the week.
Pros: Compact, Durable, Easy To Use, Multifunctional, Targets Muscles