Mediocre but gets the job done. c do fine, but there are a few caveats. The cables themselves are very stiff, making it difficult to power multiple drives stacked in a rack (especially difficult/impossible to stack 2.5" drives on top of each other, 2 for each 3.5" bay) , and also the plugs are reversed. So you have to twist something, which becomes more difficult due to hard wires. Finally, I can not speak about it, but I would hesitate to pair them in series, only one complement is safe, but I will not recommend more.