I think the RS-232 port needs to be viewed as a software enhancement not a technology upgrade path.

When you receive a 950, you get what comes in the box. Unless yours is defective and swapped out with a new unit, that's it.

The Rotel 1066 can have its software ungraded, which basically means fixing bugs, not a major leap in technology. What what I have read/understand, people have already upgraded their Rotels to add DD EX and fix a couple of bugs.

I agree with santaclarajim, the complexity of these processors and the software that runs on them, make the ability to upgrade it invaluable. If you cannot upgrade the software, you either are an early adopter and live with any significant bugs, or you are a late adopter, get the improved code, but go without a processor for many months. The upgradable software gives you the best of both worlds.