The disadvantage is that it takes longer to load. You get one exposure for every two banners displayed on your site. The banner size is 400x50 pixels. Maximum size 8kb without compression. 468x60 banner must be on the first screen view on the pages they are on.
Animations are ok.
Banners must be less than 9kb. Banner size is 400x50 pixels. Banner size is 468x60 pixels. Animations are ok but should be less than 20kb in size. Your can earn money by placing their banner on your site.