or maybe laser trimming those resistors is now cheaper??
New discrete R2R Multibit 2 box from CEC
Using discrete R2R Ladder Multibit (from MSB), looks like they now know not to go bitstream (Delta Sigma) for the best d to a conversion.
As their previous model/s I believe they tried the far cheaper Delta Sigma route.
http://www.cec-international.com/
http://www.cec-international.com/images/fulls/06.jpg
Cheers George