I have an rubber hex dumbbells from various vendors (Fringe, York, and Cap), and they are all virtually identical. If you want rubberized hex dumbbells, you are probably better off just going with the Cap ones, as they tend to be widely available and less expensive than the name-brand versions (significantly so, in some cases). Ultimately, they perform as expected and are probably the best value if you are looking to build a set of fixed dumbbells.
Performance
Value
Build Quality