We also just got one with the RBZ, and yes I notice that newer software isn't available from Dodge (haha) or the mofv.com site. I suppose the DVD is just for data, as I put a retail movie DVD in and it only played audio - FAIL. This is the in-dash one by the shifter, we didn't get the back seat facing one. Didn't really read the features on the multimedia thing it is.
I tried different USB media (small flash drive, and a very fast solid state 64 GB drive) and wasn't impressed at the speed, it seemed slower than USB version 1. I suppose I could dig up a CD or DVD and burn, though it has been a few years and that seems antiquated.
It also isn't conducive to copying music from the iPod, but that is more Apple's proprietary format of music on that. I just got my wife a mini plug male to male cable, although when I get a chance I will put some music on the HDD.
Ultimately I can't expect it to run like a supercomputer, it is just a novelty, clunky and slow. I tried importing around 1,000 songs, and I think it is capped at 400 at a time. I also picked like 20 pictures, just in the JPG format, and didn't shrink them down; so they were about 100 MB in size. It took an hour to copy - quite pathetic.
We have the bluetooth pairing, but no NAV. Oh well, it at least does something with the bells and whistles.
I have been in the IT field for almost 15 years, so my standards are probably loftier.