I quite appreciated the D-Premier review especially as I am an owner of the device. As all the software upgrades change and improve this thing I am wondering which OS was used for the quite extensive measurements. I also fully concur with the comparision of SPDIF (I am using my antique Meridian 208 as transport) input to WiFi. The last AIR 1.5 upgrade somewhat reduced that difference but may be I should look into an USB/SPDIF converter.
One aspect of the D-Premier which was not mentioned in the review is the digital crossover function which was one of the reasons I bought that amp. The sound I get using this function is far more dynamic and elaborating of musical details than using the same speakers with a passive crossover.