Just got my MAC unequal lengths today. Hope to put them on over thanksgiving.
Quality looks good at a quick glance and the HTS coating looks ok (was told it's not like ceramic but won't burn right off like paint either) so I'll have to see how that holds up. Came with bolts and copper gaskets (that surprised me, they could have just supplied the normal cheap gaskets) so I think I'll be happy with them.
Looking at your performance chart and having now seen a pair, at this point I'd have to say I'd recommend them from what I can see.