i'm thinking of buying iwork for my mac, but if i buy it from the mac app store do i still have all the same functions? and if someday something happened to my laptop can i still redownload them for free after i paid for them the first time? (i'm a fist time mac user i'm not familiar with this area) thanks 
since iwork as a CD costs about 120$ however on the app store its 60$
since iwork as a CD costs about 120$ however on the app store its 60$