Really cheap aluminum bare head? Any good?

A buddy of mine has used a few pair of those pro comp heads and they seem ok. We did a side by side comparison to some 440 source heads that I bought and they are very similar... almost like made in the same factory. The 440 source look like factory heads on the ends instead of just being machined flat, and they have heli coils in all the exhaust bolt holes and 3 of the 5 rocker shaft hold down holes, the spark plug holes were maybe different too I don't remember now. I don't know how they will hold up over time but his bracket cars haul *** with them.