Focusing screens are good. But note that they are only good! .. not excellent or fantastic or a must have.
For macro photography, I doubt you'll see any benefit.
summary:
if you want a better focus screen for macro only .. I'd say you won't really see any significant benefit. (that's just a theory, of course I have no idea on your style, likes/dislikes/etc)
BUT!(see!! again
) .. if you want it for general photography, and you have fast enough
lenses .. for sure.
if you don't have f/2 and faster
lenses ... forget it. it'll be a backward step for 'ya.