Changed the transmission fluid to GM Synchromesh FM as it worked great in the past in my old 6MT TL.
Initial impressions: less to no "crunch" when shifting a cold transmission. Slightly dampened feeling when shifting through the gates (like it's thicker fluid).
I never had any issues with grinds in my transmission, only noisy and notchy shifting with the occasional hang-up into 4th gear. The 1 > 2 shift has never been very quick and almost always requires a slight pause in neutral and this has not changed with the fluid swap. It does feel less "crunchy" though.