Since you are still in the break-in period I would suggest you to not overwork your engine as what subaru manual states, under 4k RPM. Also I wouldn't want to underwork your car either ... I wouldn't be in 4 or 5th gear going 30mph etc.
My experience with rev matching is when you get use to your car and really watch the rev rates of each gear. You will soon learn more and more of your car as you drive it more. Rev matching will in fact save your clutch (depends HOW you drive it) of course. Break in your car before you start going crazy with rev matching and downshifting =]