I owned the Ironmaster dumbbells with the heavy handle kit for a couple of years. These things are built like a tank and have the feel of a regular dumbbell which I really liked. With the heavy handle kit they seemed to be perfectly balanced in use. I liked the square design. These won't roll away. The knurling is also good. There are no plastic parts and get 5 stars on build quality without a doubt. They do take a minute, probably more like 30ish seconds to switch weight which I found to be annoying. This is the main reason I got rid of these and switched to a full set of dumbbells. Supersets and drop sets weren't a thing when I had these. If you're limited on space, want something durable, and don't mind the time it takes to change the weight, these would fit the bill and would be a good option.
Performance
Value
Build Quality