Okay, so the inconsistent/faulty switch not only occur on BWU but BWE too... (good job razer, you win big time!!!)
From what u said, i can tell you that BWU is worse. There are some switch really make ''thud'' sound instead of ''tick''(which at first i thought caused by the led down there) and those keys feel softer and easier to press... . Some is even so linear(lol may be like a brown switch?) till i barely feel the tactile bump and sound. It occur severely for my key ''1'' and ''2''   (most often used...). It occur less severely on ''6'' to ''0'' and also sleep key and some of ''F'' keys. . Luckily, all my alphabet keys(include ZXC ) does ''tick'' consistently(up to 80% consistency la... ), though still have different between the ''tick'' sound...

All i can say is blue switch might not be a safe choice if you are a picky person(as it is also the easiest spoiled MX switch, such as loss of the ''tick'' sound as dust gathered inside the switch).

I wanted to get the xarmor before i got the ducky actually but I have read alot of problems about it, in fact both xarmor and razer are made under the same manufacturer..

zowie keyboard seemed impressive as well...
there are quite a number of good mechs out there...
i hope the one edifier is brining in is the zowie..

Prefer Filco or Cherry

There might be another mechanical keyboard for gamers coming out soon.