I'm not sure why it's so fashionable for one to hate on the Blackwidow, but the build quality isn't as bad is people make it out to be. Sure they aren't using Costar stabilizers, and sure the soldering job isn't as clean as one on Filcos, but in the end the Blackwidow isn't bad at all considering that it's inexpensive, has macros that some can benefit from, and doesn't look bad at all. You can argue that the Filco has cleaner aesthetics but Razer boards don't look childish or ugly at all.
I'm going to bash Filco for a bit and say that their pricing is not competitive at all when QFR's sell for literally $100 less regularly (Lowest price was $35+shipping for a QFR) while the two barely have differences in build quality at all. They both sport the same minimilistic design, both have little flex, and both use Costar as their OEM. You'll only start finding differences when you open up the boards, and even then it is VERY questionable whether the differences between the two is worth $100 more, because for the vast majority of people, it's not. You're only paying for the Filco branding and the "Made in Japan" sticker.