@ShaneD
I never had the stock T60RP headphones. Sorry. Based on all the reviews of the stock T60, it was a planar with rolled off bass which I had basically zero interest in. The T60RP Argons don’t slack in the bass department (with the right pads, see below).
Although my friend @Gravitas has heard both the T60 stock and Argon (and I believe he recently bought some used T60RP Argons) so feel free to hit him up. By the way, you absolutely want BEEFY amplifier power to get the most out of the Argons. They are seriously power hungry planars.
Semi-relevant: here’s my small pad rolling adventure with the T60 Argon.