Aerohead 360 heads...any good?

I custom order the heads to my specks and after 4 sets have only had 1 problem. the exhaust side of 1 head being to rusted to seal the exhaust gasket .I tore the head down and took it to a machine shop and had it resurfaced ,but they only wanted to pay 20dollars of the 60 labor charge .but there work was good