Fortunately I don' t have to do any rev-matching downshifting in my normal drivign since most of my commute is getting up to speed and then slowing down for traffic lights to a stop.
But yes, I do attempt to rev match when shifting up or down. The ratios in the transmission equate to a 400-500 difference in RPM between changes. However, this does not ensure a smooth shift. The ONLY way to do it is to let the clutc absorb some of the differential in trans vs. engine RPM There is such a delay in pressing the throttle to RPM increase (drive by wire taking it's sweet time). It has taken nearly 6,000 miles of driving to not get whiplash between gears. (that is an exaderation but you get my point).