My impression over the years has been that the blend has become less international/French, and more Tempranillo, and has become a higher quality wine as the vines aged. But, my initial optimism about aging / complexity has not been matched by the bottles I’ve cellared. And - not that I can really pick out what a prototype RdD should be like - I don’t get any particular sense of place from them. But to be fair, I never did: the ones from a generation ago were like polished right banks; newer ones taste like good rich big wines without some regional calling card.
They make a lot of this (14k cases) and Eric Solomon ensures its widely available now, so perhaps others will chime in changes over time. I still buy it, when price and (my) vintage perception align, but not in the quantity of years ago. That’s true of a lot of stuff though!