I don't rate BeQuiet psu's as they tend to be very overpriced and qulity varies massively. FSP makes the majority of their psu's and have been hit or miss for years. They also have a history of building units that suffer from high ripple. A lot of the time people buy them because they have a supposedly quiet fan yet pay little attention to the quality of what is inside.
As for the Kolink, we already know that the Continuum is a fairly capable unit (still wouldn't recommend one though), just as it should be for the price. The real question is how poor these cheaper units are. Nobody has got their hands on any of them and until I see a review that says something different then they are crap to be avoided. Some of them have pathetically weak 12v rails but people don't check the details. They see that they can get a psu that is labelled 500w for less than £30 and think they are getting a bargain. In the case of the Kolink Core series 500w at £28.99 they are getting a unit with only 396w on the 12v rail. Even worse is that underneath the rail power breakdown even Kolink only rates it at 400w total continous power!!