commando's vs. eddie rpm's

Actually they are using different alloy's and they make the deck surface of the heads thicker to make them sturdier, as for the rest of the head they are still casted about the same as they were, about 3/16 thick and thats it. Alot depends on who casted them and what grade of material that they used, factory casting are thin and crack with regularity, from the eddies that I seen they are thin in spots and pourious and don't weld very good. Then there are Brodix and others that are high grade material and thick for porting, but as the old addiage go's you get what you pay for. I'd rather spend $1,800-$2,500 on a good set of heads that will be around for along time then have to spend the money twice and do the work twice. The high grade heads are 1/2-5/8 thick in the decks, and race only heads are 3/4-1" thick in the decks on big blocks, but they are also $2,500 each bare. But were getting off track here.
Will aluminum heads work, sure they will but will they be efficient and be the best for the job intended I seriously doubt it. Then you have to put a cost on them for the job performed, IMO weather you use eddies or commandos or magnums, figure out the cost and what your trying to achieve and see if it's feasiable. I just don't see spending $1,500.00 by the time it's all said and done (minimum)to turn a engine 5,000 rpm's a time or two. When a set of good stock castings can and will do the same job for less. But I'm not the one spending the $$$$ so it's up to the end user as to what they want and do.