The compact comes with a sponge, but you can completely chuck that (or just keep it for light touch-ups) and use a large powder brush or a kabuki brush instead.
It has a rather heavy coverage and it leaves you with a very matte finish, which can look a bit unnatural if caked too heavily onto your face. I’ve tried the liquid Studio Fix before and thought that was horrible, but the powder variant has its uses.
Their lipsticks come in second and the Studio Fix powder foundation is a close third. My absolute favourite product in the entire MAC Cosmetics range is the Mineralize Skinifinish Natural powder. 2015 Edit: Please see the follow-up post to this one here.)