You make me laugh you lot.!! . . . . Your quite happy to pay peanuts for the parts but then whinge and whine when they aren't top quality.!
WTF do you expect when You couldn't even buy one decent Angular contact bearing in this country for the price payed for both Blocks with bearings.

I strip, grease and shim every BK/BF bearing. It Takes minutes to do and other than that they are mostly fine considering the price payed.

Yes I could make my own better but unless chasing true Zero Backlash like Jonathan mentions then I'd just be wasting time and money because the BK/BF blocks when fettled work perfectly fine for any normal router machine.