Well the DRG cardiology comes in a titanium version, which is much lighter than the steel chest piece.
The eartips are gel, and they have some liquid inside them making them much more form fitting than any other type of ear tip.
And there is Bose technology in the stethoscope.
Also the tubing is a different type of tubing and it will not break down over time, even if it comes into contact with your skin (the PVC tubing does, which is what the Littmann's are made of).
So, it seems based on what I have read to be a superior stethoscope.
I read a review that an EMT did, and he said it was better than the Littmann master cardiology
(or cardiology III, I can't remember which) but he already had a Littmann and didn't want to replace it and spend more money. But he said if he didn't already buy the Littmann, he would have went with the DRG (which he saw at a fair after the fact).
So we will see.