I haven't heard either, but I was very interested in Lexicon and I came very close purchasing RT-20. That's when I did image search on google and noticed the internals of DV-9600 and RT-20 are virtually identical. The only differences I could find were the extra balanced digital audio output and component video outputs on RT-20. The other parts seem to be identical down to the circuit boards. Here are some of the pictures.
Marantz DV-9600
Lexicon RT-20
Both are priced similarly in the used market, with RT-20 slightly higher than DV-9600.
Marantz DV-9600
Lexicon RT-20
Both are priced similarly in the used market, with RT-20 slightly higher than DV-9600.