Reliability isn't so much an issue when you start with quality materials and utilize proper welding techniques. All of the components in this setup have been fully back purged and have full weld penetration. I don't forsee any cracking issues at all anywhere with these manifolds.
So many want to make a bold claim as you have but what they don't realize is that the ones that do crack are ones that were not welded properly, have poor welds, were not back purged or used poor materials.