I just listened to the Rubinstein/Reiner version on RCA tonight.
There is no other piece of classical music that I know as well as this concerto, and cut my teeth as a kid listening to Sviatoslav Richter's Russian/virtuoso/testosterone driven version. Richter was in his thirties and at his physical peak with otherworldly keyboard command. It's still one of the best.
But the Rubinstein is so very different. He's older but not exactly elderly for a concert pianist. He has command and power, but allows the piece to ebb and flow, to interact with the orchestra. It starts problematic, with Reiner bringing the orchestra too much to the forefront, but quickly Rubenstein takes command. Such sublety and nuance. It's definitely a more mature interpretation, with emphases that I've never heard before. I listened to it twice, cold chills both time, wet eyes both times.
I highly recommend it for those that have one of the bombastic versions and would like hear another take.