I too just purchased the D16 package with few more receivers, mainly for use as IFB.
My first impressions after very short tests so far, Positive:
Build quality seems very good
Sound quality seems very good and supplies enough power to drive headphones (ATH50)
USB powering is a nice idea, though NIMH battery charging is possible only when unit off
For the Negative there are few things that just don't make sense to me,
Headphone volume is in the menu, also menu is not very intuitive. (especially if you think of directors trying to change volume)
Battery caddy is not very comfortable but not so critical for me
Also i still didn't test it with the line inputs of my 633, does anyone have any experience with that?
And one last thing about the Sony support, I thought to ask them to change the volume settings on the next firmware but i see no forum and no email for support, guess I've gotten used to the great support you get from SD and Lectro