LOL, those manifolds are all over the place when it comes to quality.
A stolen design, made cheap, for cheapskates. What could go wrong???
This is what I have seen on these intakes.
1. Incorrect hole angle for the bolts that go into the head. These are machined at 90 degrees, which is not the correct angle.
2. Intake mating surfaces not machined flat or parallel, allowing water to leak into the engine or vacuum leaks.
3.Massive core shift, with dismal port alignment.
4. Actual holes in the manifold from casting issues at the foundry.
And the people who sell these manifold, know all about these problems, and don't care..
Roll the dice and buy one, just don't complain when you have to spend the same money getting it made serviceable by a machine shop.