4age RWD cast turbo manifolds - any good?

[Hachiroku]

Anyone here had experience with those cheap cast turbo manifolds for a 4age? They're all over E-Bay and pop up on Trademe now and then, usually to suit a T25/T28. Seem like a good option as long as they don't crack? Must be better than those shitty stainless manifolds? Thoughts?