Frank,
I believe the deal is or was this;
For the price, many guys have had decent results with those heads. But according to bad experiences becuase of dealing with many of these most professional head porters have seen things of negatives the average customer usually doesn't see or experience.
It is not the heads which had little to few errors in them where the problems were/are. IT is the ones which escaped with costly errors in them that began giving these the bad reputation. We have seen and if you check this at any heavy teck forum you will see some of the same problems were experienced by a variety of different users and head shops. On error that ate a buyer alive was no matter how hard he tried, the rocker arm would not line up even with the valve and pushrods in his engine. That error from the mfg cost the buyer a ton of money to get corrected becuase the rocker stud bosses were all in the wrong place. I magne fixing that little error. His other head was ok. It is well known that the castings are a thin casting. It is well known that the advertised flow numbers are bogus on anyone's bench. It is also well known that for the port flow they do have the port csa is huge in comparison.
The cylinder head Ghru like Curtis Boggs etc, have no financial reason to talk against these becasue it is money in the bank to have to fix them when the ones with the errors show up. There may not have been many but there were enough so that several different shops experienced repairing issues with them.
Ed