I use alot of pattern parts in my businesses on machines with great success BUT some of it is utter shite !
you only way you find out is by trying them, on a high moving part different brands can be tried and tested then decisions made going forward, but with something like this manifold you will likely only need one, so the saving will far negate the cost of a replacement if it turns out to be crap

As the old saying goes "you pay your money and take ur chances"