When I look at buying tickets online, it gives me the option of adding MaxPass (just like adding the Park Hopper option). So I'm confused about why people say you can't purchase until in the park?[/
In my case I had purchased my tickets before MP was launched so we couldn’t add it until our tickets were activated. I see that has changed now. It appears on the site you have to purchase MP for every day though so I’d probably still wait till I got to the parks to purchase. We didn’t need MP every day so it was nice to be able to choose which days I wanted it.