Comfort is a relative term. Comfort is not the same from person to person. When I feel those soft mushy shifts it’s makes me cringe because you know the clutches are slipping themselves to their inevitable death. I’ve done some jmod’s and never had an issue with a shift being too harsh. Doing a jmod will not reduce any form of reliability, it will in fact, increase transmission life because the clutches are applying faster so there is less slip and less heat build up, that adds up to a happier transmission. The harshness of the shift can be tuned through how large you drill holes in the plate.Lots of "maybes" here. I wouldn't touch it, let alone put in something like a shift kit if you still want good drivability and reliability. All of those things will make the car slightly worse to drive from a comfort standpoint.