Actually... there's been numerous reports of quality problems on the QFR...
Especially MX-Blue, because the switch has a complicated slider that is very sensitive to the leaf tension... if there's too little leaf tension it "doesn't" make the click sound...
Also, people have reported that the QFR quality has gone down... non clicking keys, non-functioning keys, entire rows non-clicking/functioning.
If you get it from Amazon, you're covered, but in general... I'd say from Here on, stick with Filco if you want Cherry MX..