I have been listening to his own recordings and I can't really say I think they are all that great.
His concertos seem so rushed and works like the G minor prelude sounds very poor in the rhythm.
But he plays some of his works very amazing and esp his Chopin (Like the E flat brilliante waltz)
What are you opinions on his own recordings?
You have to remember that Rachmaninov was born in the 19th century, which had very different performance traditions compared to now. If you listen to his Chopin Waltzes, they contain an incredible amount of rubato that you won't hear in his other recordings. This is likely due to that he was being faithful to the composer that was then regarded to have played like Padrewski, with an infinite amount of rubato and breaking of the hands.
As for the concertos, they had a bastard of a chairman at RCA who considered not even recording anything from Rachmaninov! What a loss that would be! Thankfully, some sane engineer managed to persuade the CEO to allow them to record. Even so, RCA rejected the idea of recital programs for recordings, which was a great loss.
The 3rd concerto was especially rushed, because the chairman was present at the recording (see The Flying Inkpot for more info:
https://inkpot.com/classical/rachplaysrachn.html ). Also, recording in the past was chopped up into 4:30 minute sessions - it's hard to maintain any kind of spontaneity or continuity. Despite that, his 2nd concerto (1929) is probably the best recording of it, and his other concerti are quite good too.
As for his solo recordings, I find his recordings of his own works quite metronomically strict, as if he were recording for future generations. But his other recordings are fantastic (Scherzo 3 and Ballade 3 by Chopin come to mind).