The problem with these "small parts" is usually that which is not worth it to post carrying the defective part besides filling any list etc. the price, that is like it goes to zero.
I wrote to the seller accordingly, hoping he is accommodating enough, especially since the supply was rather less afloat.
In fact, I have received two new controller after a few mails and some time. That is perfectly fair. Therefore now upgrading from one to three stars! (I have the new control but not yet tested ...)
Although I had only ever drangehängt a fan, according to the manufacturer is apparently a "smoked" by two because one of my fans to Watt Stark was. These are (as already to be connected fan number) information that you would like to have quite beforehand! A fan was thus already at delivery out of the second was with me probably overloaded and was then immediately blown.
Conclusion: For smaller case fans okay when only one fan for each controller is connected, never more, CPU fan or fans with more than max. 3 to 3.5 watts!
Despite the goodwill, but I can give it no more than three stars. Because - first - is nowhere to a word in the product description and - secondly - the delivery deadline remains still unflott.
I hope that I have now a set of four functioning regulators have (or even five). But since I only need four, I would be so happy now. This is a "3" = three stars.