The manifolds are fine now, they have bracing bars to stop them from cracking and the welding and finish is actualy very good. I am not saying get one because they are great but if your handy with the spanners and dont mind some work they are great value for money and they do work.
I personly would not put one on my car and would not like to fit one again because it was a pain in the arse and nothing fits correctly. All that considered the kit I fitted on Aristo above cost £600 and that included the intercooler. We just had to make the intercooler pipe work, modify the downpipe, modify the manifold, modify the screamer pipe........etc......etc... you get the picture.