I did have a Reference Platinum for a while and liked it very much. It was relatively early in my cartridge evolution/experience and I loved how "sweet" it was. To my ears it was everything the Prestige Gold (that preceded it) was, but better. But I didn't have it on a very good table and it hummed a little more than I was willing to be satisfied with. I think I went to the Nagaoka MP-500 after that and thought at the time it was everything the Ref. Plat. was but better yet - better tracking, quieter (no hum, lower noise floor), and perhaps more "correct" and less "Grado" if that makes any sense. The MP-500 is what I settled on when I did turntable three-card-Monty here recently and ended up with the VPI Scout, and am very pleased.
I should also note that with the Reference Platinum I also had the wood-boxed Grado phono stage and rare Grado phono interconnects, which was a nice trio - obvious synergy, if you're in to that sort of thing. I sold the combo to a local guy who ran a music recording studio and wanted something "hi-fi" when listening to test pressings sent from the plant.
Unfortunately, I have not gone up the Grado line. I'm interested to see what others have to say, too. (And in answer to the thread topic, no I no longer run a wood body Grado.)