I have DDS Pro with an EAD 7000 MK III.
I've just added a Dti Pro 32 and it's a very worthwhile upgrade considering the low cost.
The soundstage is bigger, more width and a little more depth. The sound is cleaner, maybe a tad too bright for the more harsh sounding solid state equip out there, but great with my CJ tubes.
If you need to know anything else about this setup, drop me a line.